509 lines
19 KiB
JavaScript
509 lines
19 KiB
JavaScript
$(document).ready(function() {
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module("Collections");
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test("each", function() {
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_.each([1, 2, 3], function(num, i) {
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equal(num, i + 1, 'each iterators provide value and iteration count');
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});
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var answers = [];
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_.each([1, 2, 3], function(num){ answers.push(num * this.multiplier);}, {multiplier : 5});
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equal(answers.join(', '), '5, 10, 15', 'context object property accessed');
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answers = [];
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_.forEach([1, 2, 3], function(num){ answers.push(num); });
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equal(answers.join(', '), '1, 2, 3', 'aliased as "forEach"');
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answers = [];
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var obj = {one : 1, two : 2, three : 3};
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obj.constructor.prototype.four = 4;
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_.each(obj, function(value, key){ answers.push(key); });
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equal(answers.join(", "), 'one, two, three', 'iterating over objects works, and ignores the object prototype.');
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delete obj.constructor.prototype.four;
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var answer = null;
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_.each([1, 2, 3], function(num, index, arr){ if (_.include(arr, num)) answer = true; });
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ok(answer, 'can reference the original collection from inside the iterator');
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answers = 0;
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_.each(null, function(){ ++answers; });
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equal(answers, 0, 'handles a null properly');
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});
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test('map', function() {
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var doubled = _.map([1, 2, 3], function(num){ return num * 2; });
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equal(doubled.join(', '), '2, 4, 6', 'doubled numbers');
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doubled = _.collect([1, 2, 3], function(num){ return num * 2; });
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equal(doubled.join(', '), '2, 4, 6', 'aliased as "collect"');
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var tripled = _.map([1, 2, 3], function(num){ return num * this.multiplier; }, {multiplier : 3});
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equal(tripled.join(', '), '3, 6, 9', 'tripled numbers with context');
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var doubled = _([1, 2, 3]).map(function(num){ return num * 2; });
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equal(doubled.join(', '), '2, 4, 6', 'OO-style doubled numbers');
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if (document.querySelectorAll) {
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var ids = _.map(document.querySelectorAll('#map-test *'), function(n){ return n.id; });
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deepEqual(ids, ['id1', 'id2'], 'Can use collection methods on NodeLists.');
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}
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var ids = _.map($('#map-test').children(), function(n){ return n.id; });
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deepEqual(ids, ['id1', 'id2'], 'Can use collection methods on jQuery Array-likes.');
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var ids = _.map(document.images, function(n){ return n.id; });
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ok(ids[0] == 'chart_image', 'can use collection methods on HTMLCollections');
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var ifnull = _.map(null, function(){});
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ok(_.isArray(ifnull) && ifnull.length === 0, 'handles a null properly');
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});
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test('reduce', function() {
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var sum = _.reduce([1, 2, 3], function(sum, num){ return sum + num; }, 0);
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equal(sum, 6, 'can sum up an array');
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var context = {multiplier : 3};
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sum = _.reduce([1, 2, 3], function(sum, num){ return sum + num * this.multiplier; }, 0, context);
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equal(sum, 18, 'can reduce with a context object');
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sum = _.inject([1, 2, 3], function(sum, num){ return sum + num; }, 0);
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equal(sum, 6, 'aliased as "inject"');
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sum = _([1, 2, 3]).reduce(function(sum, num){ return sum + num; }, 0);
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equal(sum, 6, 'OO-style reduce');
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var sum = _.reduce([1, 2, 3], function(sum, num){ return sum + num; });
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equal(sum, 6, 'default initial value');
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var prod = _.reduce([1, 2, 3, 4], function(prod, num){ return prod * num; });
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equal(prod, 24, 'can reduce via multiplication');
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var ifnull;
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try {
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_.reduce(null, function(){});
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} catch (ex) {
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ifnull = ex;
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}
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ok(ifnull instanceof TypeError, 'handles a null (without initial value) properly');
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ok(_.reduce(null, function(){}, 138) === 138, 'handles a null (with initial value) properly');
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equal(_.reduce([], function(){}, undefined), undefined, 'undefined can be passed as a special case');
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raises(function() { _.reduce([], function(){}); }, TypeError, 'throws an error for empty arrays with no initial value');
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});
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test('reduceRight', function() {
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var list = _.reduceRight(["foo", "bar", "baz"], function(memo, str){ return memo + str; }, '');
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equal(list, 'bazbarfoo', 'can perform right folds');
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var list = _.foldr(["foo", "bar", "baz"], function(memo, str){ return memo + str; }, '');
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equal(list, 'bazbarfoo', 'aliased as "foldr"');
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var list = _.foldr(["foo", "bar", "baz"], function(memo, str){ return memo + str; });
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equal(list, 'bazbarfoo', 'default initial value');
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var ifnull;
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try {
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_.reduceRight(null, function(){});
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} catch (ex) {
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ifnull = ex;
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}
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ok(ifnull instanceof TypeError, 'handles a null (without initial value) properly');
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var sum = _.reduceRight({a: 1, b: 2, c: 3}, function(sum, num){ return sum + num; });
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equal(sum, 6, 'default initial value on object');
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ok(_.reduceRight(null, function(){}, 138) === 138, 'handles a null (with initial value) properly');
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equal(_.reduceRight([], function(){}, undefined), undefined, 'undefined can be passed as a special case');
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raises(function() { _.reduceRight([], function(){}); }, TypeError, 'throws an error for empty arrays with no initial value');
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// Assert that the correct arguments are being passed.
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var args,
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memo = {},
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object = {a: 1, b: 2},
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lastKey = _.keys(object).pop();
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var expected = lastKey == 'a'
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? [memo, 1, 'a', object]
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: [memo, 2, 'b', object];
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_.reduceRight(object, function() {
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args || (args = _.toArray(arguments));
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}, memo);
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deepEqual(args, expected);
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// And again, with numeric keys.
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object = {'2': 'a', '1': 'b'};
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lastKey = _.keys(object).pop();
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args = null;
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expected = lastKey == '2'
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? [memo, 'a', '2', object]
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: [memo, 'b', '1', object];
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_.reduceRight(object, function() {
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args || (args = _.toArray(arguments));
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}, memo);
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deepEqual(args, expected);
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});
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test('find', function() {
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var array = [1, 2, 3, 4];
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strictEqual(_.find(array, function(n) { return n > 2; }), 3, 'should return first found `value`');
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strictEqual(_.find(array, function() { return false; }), void 0, 'should return `undefined` if `value` is not found');
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});
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test('detect', function() {
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var result = _.detect([1, 2, 3], function(num){ return num * 2 == 4; });
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equal(result, 2, 'found the first "2" and broke the loop');
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});
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test('select', function() {
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var evens = _.select([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; });
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equal(evens.join(', '), '2, 4, 6', 'selected each even number');
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evens = _.filter([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; });
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equal(evens.join(', '), '2, 4, 6', 'aliased as "filter"');
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});
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test('reject', function() {
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var odds = _.reject([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; });
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equal(odds.join(', '), '1, 3, 5', 'rejected each even number');
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var context = "obj";
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var evens = _.reject([1, 2, 3, 4, 5, 6], function(num){
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equal(context, "obj");
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return num % 2 != 0;
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}, context);
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equal(evens.join(', '), '2, 4, 6', 'rejected each odd number');
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});
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test('all', function() {
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ok(_.all([], _.identity), 'the empty set');
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ok(_.all([true, true, true], _.identity), 'all true values');
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ok(!_.all([true, false, true], _.identity), 'one false value');
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ok(_.all([0, 10, 28], function(num){ return num % 2 == 0; }), 'even numbers');
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ok(!_.all([0, 11, 28], function(num){ return num % 2 == 0; }), 'an odd number');
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ok(_.all([1], _.identity) === true, 'cast to boolean - true');
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ok(_.all([0], _.identity) === false, 'cast to boolean - false');
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ok(_.every([true, true, true], _.identity), 'aliased as "every"');
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ok(!_.all([undefined, undefined, undefined], _.identity), 'works with arrays of undefined');
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});
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test('any', function() {
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var nativeSome = Array.prototype.some;
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Array.prototype.some = null;
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ok(!_.any([]), 'the empty set');
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ok(!_.any([false, false, false]), 'all false values');
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ok(_.any([false, false, true]), 'one true value');
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ok(_.any([null, 0, 'yes', false]), 'a string');
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ok(!_.any([null, 0, '', false]), 'falsy values');
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ok(!_.any([1, 11, 29], function(num){ return num % 2 == 0; }), 'all odd numbers');
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ok(_.any([1, 10, 29], function(num){ return num % 2 == 0; }), 'an even number');
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ok(_.any([1], _.identity) === true, 'cast to boolean - true');
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ok(_.any([0], _.identity) === false, 'cast to boolean - false');
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ok(_.some([false, false, true]), 'aliased as "some"');
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Array.prototype.some = nativeSome;
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});
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test('include', function() {
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ok(_.include([1,2,3], 2), 'two is in the array');
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ok(!_.include([1,3,9], 2), 'two is not in the array');
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ok(_.contains({moe:1, larry:3, curly:9}, 3) === true, '_.include on objects checks their values');
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ok(_([1,2,3]).include(2), 'OO-style include');
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});
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test('invoke', function() {
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var list = [[5, 1, 7], [3, 2, 1]];
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var result = _.invoke(list, 'sort');
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equal(result[0].join(', '), '1, 5, 7', 'first array sorted');
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equal(result[1].join(', '), '1, 2, 3', 'second array sorted');
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});
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test('invoke w/ function reference', function() {
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var list = [[5, 1, 7], [3, 2, 1]];
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var result = _.invoke(list, Array.prototype.sort);
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equal(result[0].join(', '), '1, 5, 7', 'first array sorted');
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equal(result[1].join(', '), '1, 2, 3', 'second array sorted');
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});
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// Relevant when using ClojureScript
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test('invoke when strings have a call method', function() {
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String.prototype.call = function() {
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return 42;
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};
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var list = [[5, 1, 7], [3, 2, 1]];
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var s = "foo";
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equal(s.call(), 42, "call function exists");
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var result = _.invoke(list, 'sort');
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equal(result[0].join(', '), '1, 5, 7', 'first array sorted');
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equal(result[1].join(', '), '1, 2, 3', 'second array sorted');
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delete String.prototype.call;
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equal(s.call, undefined, "call function removed");
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});
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test('pluck', function() {
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var people = [{name : 'moe', age : 30}, {name : 'curly', age : 50}];
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equal(_.pluck(people, 'name').join(', '), 'moe, curly', 'pulls names out of objects');
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});
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test('where', function() {
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var list = [{a: 1, b: 2}, {a: 2, b: 2}, {a: 1, b: 3}, {a: 1, b: 4}];
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var result = _.where(list, {a: 1});
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equal(result.length, 3);
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equal(result[result.length - 1].b, 4);
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result = _.where(list, {b: 2});
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equal(result.length, 2);
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equal(result[0].a, 1);
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result = _.where(list, {a: 1}, true);
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equal(result.b, 2, "Only get the first object matched.")
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result = _.where(list, {a: 1}, false);
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equal(result.length, 3);
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});
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test('findWhere', function() {
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var list = [{a: 1, b: 2}, {a: 2, b: 2}, {a: 1, b: 3}, {a: 1, b: 4}, {a: 2, b: 4}];
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var result = _.findWhere(list, {a: 1});
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deepEqual(result, {a: 1, b: 2});
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result = _.findWhere(list, {b: 4});
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deepEqual(result, {a: 1, b: 4});
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result = _.findWhere(list, {c:1})
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ok(_.isUndefined(result), "undefined when not found");
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result = _.findWhere([], {c:1});
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ok(_.isUndefined(result), "undefined when searching empty list");
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});
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test('max', function() {
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equal(3, _.max([1, 2, 3]), 'can perform a regular Math.max');
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var neg = _.max([1, 2, 3], function(num){ return -num; });
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equal(neg, 1, 'can perform a computation-based max');
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equal(-Infinity, _.max({}), 'Maximum value of an empty object');
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equal(-Infinity, _.max([]), 'Maximum value of an empty array');
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equal(_.max({'a': 'a'}), -Infinity, 'Maximum value of a non-numeric collection');
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equal(299999, _.max(_.range(1,300000)), "Maximum value of a too-big array");
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});
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test('min', function() {
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equal(1, _.min([1, 2, 3]), 'can perform a regular Math.min');
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var neg = _.min([1, 2, 3], function(num){ return -num; });
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equal(neg, 3, 'can perform a computation-based min');
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equal(Infinity, _.min({}), 'Minimum value of an empty object');
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equal(Infinity, _.min([]), 'Minimum value of an empty array');
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equal(_.min({'a': 'a'}), Infinity, 'Minimum value of a non-numeric collection');
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var now = new Date(9999999999);
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var then = new Date(0);
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equal(_.min([now, then]), then);
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equal(1, _.min(_.range(1,300000)), "Minimum value of a too-big array");
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});
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test('sortBy', function() {
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var people = [{name : 'curly', age : 50}, {name : 'moe', age : 30}];
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people = _.sortBy(people, function(person){ return person.age; });
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equal(_.pluck(people, 'name').join(', '), 'moe, curly', 'stooges sorted by age');
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var list = [undefined, 4, 1, undefined, 3, 2];
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equal(_.sortBy(list, _.identity).join(','), '1,2,3,4,,', 'sortBy with undefined values');
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var list = ["one", "two", "three", "four", "five"];
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var sorted = _.sortBy(list, 'length');
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equal(sorted.join(' '), 'one two four five three', 'sorted by length');
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function Pair(x, y) {
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this.x = x;
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this.y = y;
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}
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var collection = [
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new Pair(1, 1), new Pair(1, 2),
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new Pair(1, 3), new Pair(1, 4),
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new Pair(1, 5), new Pair(1, 6),
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new Pair(2, 1), new Pair(2, 2),
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new Pair(2, 3), new Pair(2, 4),
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new Pair(2, 5), new Pair(2, 6),
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new Pair(undefined, 1), new Pair(undefined, 2),
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new Pair(undefined, 3), new Pair(undefined, 4),
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new Pair(undefined, 5), new Pair(undefined, 6)
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];
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var actual = _.sortBy(collection, function(pair) {
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return pair.x;
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});
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deepEqual(actual, collection, 'sortBy should be stable');
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});
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test('groupBy', function() {
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var parity = _.groupBy([1, 2, 3, 4, 5, 6], function(num){ return num % 2; });
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ok('0' in parity && '1' in parity, 'created a group for each value');
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equal(parity[0].join(', '), '2, 4, 6', 'put each even number in the right group');
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var list = ["one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten"];
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var grouped = _.groupBy(list, 'length');
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equal(grouped['3'].join(' '), 'one two six ten');
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equal(grouped['4'].join(' '), 'four five nine');
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equal(grouped['5'].join(' '), 'three seven eight');
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var context = {};
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_.groupBy([{}], function(){ ok(this === context); }, context);
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grouped = _.groupBy([4.2, 6.1, 6.4], function(num) {
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return Math.floor(num) > 4 ? 'hasOwnProperty' : 'constructor';
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});
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equal(grouped.constructor.length, 1);
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equal(grouped.hasOwnProperty.length, 2);
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var array = [{}];
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_.groupBy(array, function(value, index, obj){ ok(obj === array); });
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var array = [1, 2, 1, 2, 3];
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var grouped = _.groupBy(array);
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equal(grouped['1'].length, 2);
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equal(grouped['3'].length, 1);
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var matrix = [
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[1,2],
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[1,3],
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[2,3]
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];
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deepEqual(_.groupBy(matrix, 0), {1: [[1,2], [1,3]], 2: [[2,3]]})
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deepEqual(_.groupBy(matrix, 1), {2: [[1,2]], 3: [[1,3], [2,3]]})
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});
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test('indexBy', function() {
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var parity = _.indexBy([1, 2, 3, 4, 5], function(num){ return num % 2 == 0; });
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equal(parity['true'], 4);
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equal(parity['false'], 5);
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var list = ["one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten"];
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var grouped = _.indexBy(list, 'length');
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equal(grouped['3'], 'ten');
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equal(grouped['4'], 'nine');
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equal(grouped['5'], 'eight');
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var array = [1, 2, 1, 2, 3];
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var grouped = _.indexBy(array);
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equal(grouped['1'], 1);
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equal(grouped['2'], 2);
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equal(grouped['3'], 3);
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});
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test('countBy', function() {
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var parity = _.countBy([1, 2, 3, 4, 5], function(num){ return num % 2 == 0; });
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equal(parity['true'], 2);
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equal(parity['false'], 3);
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var list = ["one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten"];
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var grouped = _.countBy(list, 'length');
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equal(grouped['3'], 4);
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equal(grouped['4'], 3);
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equal(grouped['5'], 3);
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var context = {};
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_.countBy([{}], function(){ ok(this === context); }, context);
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grouped = _.countBy([4.2, 6.1, 6.4], function(num) {
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return Math.floor(num) > 4 ? 'hasOwnProperty' : 'constructor';
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});
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equal(grouped.constructor, 1);
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equal(grouped.hasOwnProperty, 2);
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var array = [{}];
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_.countBy(array, function(value, index, obj){ ok(obj === array); });
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var array = [1, 2, 1, 2, 3];
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var grouped = _.countBy(array);
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equal(grouped['1'], 2);
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equal(grouped['3'], 1);
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});
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test('sortedIndex', function() {
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var numbers = [10, 20, 30, 40, 50], num = 35;
|
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var indexForNum = _.sortedIndex(numbers, num);
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|
equal(indexForNum, 3, '35 should be inserted at index 3');
|
|
|
|
var indexFor30 = _.sortedIndex(numbers, 30);
|
|
equal(indexFor30, 2, '30 should be inserted at index 2');
|
|
|
|
var objects = [{x: 10}, {x: 20}, {x: 30}, {x: 40}];
|
|
var iterator = function(obj){ return obj.x; };
|
|
strictEqual(_.sortedIndex(objects, {x: 25}, iterator), 2);
|
|
strictEqual(_.sortedIndex(objects, {x: 35}, 'x'), 3);
|
|
|
|
var context = {1: 2, 2: 3, 3: 4};
|
|
iterator = function(obj){ return this[obj]; };
|
|
strictEqual(_.sortedIndex([1, 3], 2, iterator, context), 1);
|
|
});
|
|
|
|
test('shuffle', function() {
|
|
var numbers = _.range(10);
|
|
var shuffled = _.shuffle(numbers).sort();
|
|
notStrictEqual(numbers, shuffled, 'original object is unmodified');
|
|
equal(shuffled.join(','), numbers.join(','), 'contains the same members before and after shuffle');
|
|
});
|
|
|
|
test('sample', function() {
|
|
var numbers = _.range(10);
|
|
var all_sampled = _.sample(numbers, 10).sort();
|
|
equal(all_sampled.join(','), numbers.join(','), 'contains the same members before and after sample');
|
|
all_sampled = _.sample(numbers, 20).sort();
|
|
equal(all_sampled.join(','), numbers.join(','), 'also works when sampling more objects than are present');
|
|
ok(_.contains(numbers, _.sample(numbers)), 'sampling a single element returns something from the array');
|
|
strictEqual(_.sample([]), undefined, 'sampling empty array with no number returns undefined');
|
|
notStrictEqual(_.sample([], 5), [], 'sampling empty array with a number returns an empty array');
|
|
notStrictEqual(_.sample([1, 2, 3], 0), [], 'sampling an array with 0 picks returns an empty array');
|
|
deepEqual(_.sample([1, 2], -1), [], 'sampling a negative number of picks returns an empty array');
|
|
});
|
|
|
|
test('toArray', function() {
|
|
ok(!_.isArray(arguments), 'arguments object is not an array');
|
|
ok(_.isArray(_.toArray(arguments)), 'arguments object converted into array');
|
|
var a = [1,2,3];
|
|
ok(_.toArray(a) !== a, 'array is cloned');
|
|
equal(_.toArray(a).join(', '), '1, 2, 3', 'cloned array contains same elements');
|
|
|
|
var numbers = _.toArray({one : 1, two : 2, three : 3});
|
|
equal(numbers.join(', '), '1, 2, 3', 'object flattened into array');
|
|
|
|
// test in IE < 9
|
|
try {
|
|
var actual = _.toArray(document.childNodes);
|
|
} catch(ex) { }
|
|
|
|
ok(_.isArray(actual), 'should not throw converting a node list');
|
|
});
|
|
|
|
test('size', function() {
|
|
equal(_.size({one : 1, two : 2, three : 3}), 3, 'can compute the size of an object');
|
|
equal(_.size([1, 2, 3]), 3, 'can compute the size of an array');
|
|
equal(_.size($('<div>').add('<span>').add('<span>')), 3, 'can compute the size of jQuery objects');
|
|
|
|
var func = function() {
|
|
return _.size(arguments);
|
|
};
|
|
|
|
equal(func(1, 2, 3, 4), 4, 'can test the size of the arguments object');
|
|
|
|
equal(_.size('hello'), 5, 'can compute the size of a string literal');
|
|
equal(_.size(new String('hello')), 5, 'can compute the size of string object');
|
|
|
|
equal(_.size(null), 0, 'handles nulls');
|
|
});
|
|
|
|
});
|