$(document).ready(function() { module("Objects"); test("keys", function() { equal(_.keys({one : 1, two : 2}).join(', '), 'one, two', 'can extract the keys from an object'); // the test above is not safe because it relies on for-in enumeration order var a = []; a[1] = 0; equal(_.keys(a).join(', '), '1', 'is not fooled by sparse arrays; see issue #95'); raises(function() { _.keys(null); }, TypeError, 'throws an error for `null` values'); raises(function() { _.keys(void 0); }, TypeError, 'throws an error for `undefined` values'); raises(function() { _.keys(1); }, TypeError, 'throws an error for number primitives'); raises(function() { _.keys('a'); }, TypeError, 'throws an error for string primitives'); raises(function() { _.keys(true); }, TypeError, 'throws an error for boolean primitives'); }); test("values", function() { equal(_.values({one: 1, two: 2}).join(', '), '1, 2', 'can extract the values from an object'); equal(_.values({one: 1, two: 2, length: 3}).join(', '), '1, 2, 3', '... even when one of them is "length"'); }); test("pairs", function() { deepEqual(_.pairs({one: 1, two: 2}), [['one', 1], ['two', 2]], 'can convert an object into pairs'); deepEqual(_.pairs({one: 1, two: 2, length: 3}), [['one', 1], ['two', 2], ['length', 3]], '... even when one of them is "length"'); }); test("invert", function() { var obj = {first: 'Moe', second: 'Larry', third: 'Curly'}; equal(_.keys(_.invert(obj)).join(' '), 'Moe Larry Curly', 'can invert an object'); ok(_.isEqual(_.invert(_.invert(obj)), obj), 'two inverts gets you back where you started'); var obj = {length: 3}; ok(_.invert(obj)['3'] == 'length', 'can invert an object with "length"') }); test("functions", function() { var obj = {a : 'dash', b : _.map, c : (/yo/), d : _.reduce}; ok(_.isEqual(['b', 'd'], _.functions(obj)), 'can grab the function names of any passed-in object'); var Animal = function(){}; Animal.prototype.run = function(){}; equal(_.functions(new Animal).join(''), 'run', 'also looks up functions on the prototype'); }); test("extend", function() { var result; equal(_.extend({}, {a:'b'}).a, 'b', 'can extend an object with the attributes of another'); equal(_.extend({a:'x'}, {a:'b'}).a, 'b', 'properties in source override destination'); equal(_.extend({x:'x'}, {a:'b'}).x, 'x', "properties not in source don't get overriden"); result = _.extend({x:'x'}, {a:'a'}, {b:'b'}); ok(_.isEqual(result, {x:'x', a:'a', b:'b'}), 'can extend from multiple source objects'); result = _.extend({x:'x'}, {a:'a', x:2}, {a:'b'}); ok(_.isEqual(result, {x:2, a:'b'}), 'extending from multiple source objects last property trumps'); result = _.extend({}, {a: void 0, b: null}); equal(_.keys(result).join(''), 'ab', 'extend copies undefined values'); try { result = {}; _.extend(result, null, undefined, {a:1}); } catch(ex) {} equal(result.a, 1, 'should not error on `null` or `undefined` sources'); }); test("pick", function() { var result; result = _.pick({a:1, b:2, c:3}, 'a', 'c'); ok(_.isEqual(result, {a:1, c:3}), 'can restrict properties to those named'); result = _.pick({a:1, b:2, c:3}, ['b', 'c']); ok(_.isEqual(result, {b:2, c:3}), 'can restrict properties to those named in an array'); result = _.pick({a:1, b:2, c:3}, ['a'], 'b'); ok(_.isEqual(result, {a:1, b:2}), 'can restrict properties to those named in mixed args'); var Obj = function(){}; Obj.prototype = {a: 1, b: 2, c: 3}; ok(_.isEqual(_.pick(new Obj, 'a', 'c'), {a:1, c: 3}), 'include prototype props'); }); test("omit", function() { var result; result = _.omit({a:1, b:2, c:3}, 'b'); ok(_.isEqual(result, {a:1, c:3}), 'can omit a single named property'); result = _.omit({a:1, b:2, c:3}, 'a', 'c'); ok(_.isEqual(result, {b:2}), 'can omit several named properties'); result = _.omit({a:1, b:2, c:3}, ['b', 'c']); ok(_.isEqual(result, {a:1}), 'can omit properties named in an array'); var Obj = function(){}; Obj.prototype = {a: 1, b: 2, c: 3}; ok(_.isEqual(_.omit(new Obj, 'b'), {a:1, c: 3}), 'include prototype props'); }); test("defaults", function() { var result; var options = {zero: 0, one: 1, empty: "", nan: NaN, nothing: null}; _.defaults(options, {zero: 1, one: 10, twenty: 20, nothing: 'str'}); equal(options.zero, 0, 'value exists'); equal(options.one, 1, 'value exists'); equal(options.twenty, 20, 'default applied'); equal(options.nothing, null, "null isn't overridden"); _.defaults(options, {empty: "full"}, {nan: "nan"}, {word: "word"}, {word: "dog"}); equal(options.empty, "", 'value exists'); ok(_.isNaN(options.nan), "NaN isn't overridden"); equal(options.word, "word", 'new value is added, first one wins'); try { options = {}; _.defaults(options, null, undefined, {a:1}); } catch(ex) {} equal(options.a, 1, 'should not error on `null` or `undefined` sources'); }); test("clone", function() { var moe = {name : 'moe', lucky : [13, 27, 34]}; var clone = _.clone(moe); equal(clone.name, 'moe', 'the clone as the attributes of the original'); clone.name = 'curly'; ok(clone.name == 'curly' && moe.name == 'moe', 'clones can change shallow attributes without affecting the original'); clone.lucky.push(101); equal(_.last(moe.lucky), 101, 'changes to deep attributes are shared with the original'); equal(_.clone(undefined), void 0, 'non objects should not be changed by clone'); equal(_.clone(1), 1, 'non objects should not be changed by clone'); equal(_.clone(null), null, 'non objects should not be changed by clone'); }); test("isEqual", function() { function First() { this.value = 1; } First.prototype.value = 1; function Second() { this.value = 1; } Second.prototype.value = 2; // Basic equality and identity comparisons. ok(_.isEqual(null, null), "`null` is equal to `null`"); ok(_.isEqual(), "`undefined` is equal to `undefined`"); ok(!_.isEqual(0, -0), "`0` is not equal to `-0`"); ok(!_.isEqual(-0, 0), "Commutative equality is implemented for `0` and `-0`"); ok(!_.isEqual(null, undefined), "`null` is not equal to `undefined`"); ok(!_.isEqual(undefined, null), "Commutative equality is implemented for `null` and `undefined`"); // String object and primitive comparisons. ok(_.isEqual("Curly", "Curly"), "Identical string primitives are equal"); ok(_.isEqual(new String("Curly"), new String("Curly")), "String objects with identical primitive values are equal"); ok(_.isEqual(new String("Curly"), "Curly"), "String primitives and their corresponding object wrappers are equal"); ok(_.isEqual("Curly", new String("Curly")), "Commutative equality is implemented for string objects and primitives"); ok(!_.isEqual("Curly", "Larry"), "String primitives with different values are not equal"); ok(!_.isEqual(new String("Curly"), new String("Larry")), "String objects with different primitive values are not equal"); ok(!_.isEqual(new String("Curly"), {toString: function(){ return "Curly"; }}), "String objects and objects with a custom `toString` method are not equal"); // Number object and primitive comparisons. ok(_.isEqual(75, 75), "Identical number primitives are equal"); ok(_.isEqual(new Number(75), new Number(75)), "Number objects with identical primitive values are equal"); ok(_.isEqual(75, new Number(75)), "Number primitives and their corresponding object wrappers are equal"); ok(_.isEqual(new Number(75), 75), "Commutative equality is implemented for number objects and primitives"); ok(!_.isEqual(new Number(0), -0), "`new Number(0)` and `-0` are not equal"); ok(!_.isEqual(0, new Number(-0)), "Commutative equality is implemented for `new Number(0)` and `-0`"); ok(!_.isEqual(new Number(75), new Number(63)), "Number objects with different primitive values are not equal"); ok(!_.isEqual(new Number(63), {valueOf: function(){ return 63; }}), "Number objects and objects with a `valueOf` method are not equal"); // Comparisons involving `NaN`. ok(_.isEqual(NaN, NaN), "`NaN` is equal to `NaN`"); ok(!_.isEqual(61, NaN), "A number primitive is not equal to `NaN`"); ok(!_.isEqual(new Number(79), NaN), "A number object is not equal to `NaN`"); ok(!_.isEqual(Infinity, NaN), "`Infinity` is not equal to `NaN`"); // Boolean object and primitive comparisons. ok(_.isEqual(true, true), "Identical boolean primitives are equal"); ok(_.isEqual(new Boolean, new Boolean), "Boolean objects with identical primitive values are equal"); ok(_.isEqual(true, new Boolean(true)), "Boolean primitives and their corresponding object wrappers are equal"); ok(_.isEqual(new Boolean(true), true), "Commutative equality is implemented for booleans"); ok(!_.isEqual(new Boolean(true), new Boolean), "Boolean objects with different primitive values are not equal"); // Common type coercions. ok(!_.isEqual(true, new Boolean(false)), "Boolean objects are not equal to the boolean primitive `true`"); ok(!_.isEqual("75", 75), "String and number primitives with like values are not equal"); ok(!_.isEqual(new Number(63), new String(63)), "String and number objects with like values are not equal"); ok(!_.isEqual(75, "75"), "Commutative equality is implemented for like string and number values"); ok(!_.isEqual(0, ""), "Number and string primitives with like values are not equal"); ok(!_.isEqual(1, true), "Number and boolean primitives with like values are not equal"); ok(!_.isEqual(new Boolean(false), new Number(0)), "Boolean and number objects with like values are not equal"); ok(!_.isEqual(false, new String("")), "Boolean primitives and string objects with like values are not equal"); ok(!_.isEqual(12564504e5, new Date(2009, 9, 25)), "Dates and their corresponding numeric primitive values are not equal"); // Dates. ok(_.isEqual(new Date(2009, 9, 25), new Date(2009, 9, 25)), "Date objects referencing identical times are equal"); ok(!_.isEqual(new Date(2009, 9, 25), new Date(2009, 11, 13)), "Date objects referencing different times are not equal"); ok(!_.isEqual(new Date(2009, 11, 13), { getTime: function(){ return 12606876e5; } }), "Date objects and objects with a `getTime` method are not equal"); ok(!_.isEqual(new Date("Curly"), new Date("Curly")), "Invalid dates are not equal"); // Functions. ok(!_.isEqual(First, Second), "Different functions with identical bodies and source code representations are not equal"); // RegExps. ok(_.isEqual(/(?:)/gim, /(?:)/gim), "RegExps with equivalent patterns and flags are equal"); ok(!_.isEqual(/(?:)/g, /(?:)/gi), "RegExps with equivalent patterns and different flags are not equal"); ok(!_.isEqual(/Moe/gim, /Curly/gim), "RegExps with different patterns and equivalent flags are not equal"); ok(!_.isEqual(/(?:)/gi, /(?:)/g), "Commutative equality is implemented for RegExps"); ok(!_.isEqual(/Curly/g, {source: "Larry", global: true, ignoreCase: false, multiline: false}), "RegExps and RegExp-like objects are not equal"); // Empty arrays, array-like objects, and object literals. ok(_.isEqual({}, {}), "Empty object literals are equal"); ok(_.isEqual([], []), "Empty array literals are equal"); ok(_.isEqual([{}], [{}]), "Empty nested arrays and objects are equal"); ok(!_.isEqual({length: 0}, []), "Array-like objects and arrays are not equal."); ok(!_.isEqual([], {length: 0}), "Commutative equality is implemented for array-like objects"); ok(!_.isEqual({}, []), "Object literals and array literals are not equal"); ok(!_.isEqual([], {}), "Commutative equality is implemented for objects and arrays"); // Arrays with primitive and object values. ok(_.isEqual([1, "Larry", true], [1, "Larry", true]), "Arrays containing identical primitives are equal"); ok(_.isEqual([(/Moe/g), new Date(2009, 9, 25)], [(/Moe/g), new Date(2009, 9, 25)]), "Arrays containing equivalent elements are equal"); // Multi-dimensional arrays. var a = [new Number(47), false, "Larry", /Moe/, new Date(2009, 11, 13), ['running', 'biking', new String('programming')], {a: 47}]; var b = [new Number(47), false, "Larry", /Moe/, new Date(2009, 11, 13), ['running', 'biking', new String('programming')], {a: 47}]; ok(_.isEqual(a, b), "Arrays containing nested arrays and objects are recursively compared"); // Overwrite the methods defined in ES 5.1 section 15.4.4. a.forEach = a.map = a.filter = a.every = a.indexOf = a.lastIndexOf = a.some = a.reduce = a.reduceRight = null; b.join = b.pop = b.reverse = b.shift = b.slice = b.splice = b.concat = b.sort = b.unshift = null; // Array elements and properties. ok(_.isEqual(a, b), "Arrays containing equivalent elements and different non-numeric properties are equal"); a.push("White Rocks"); ok(!_.isEqual(a, b), "Arrays of different lengths are not equal"); a.push("East Boulder"); b.push("Gunbarrel Ranch", "Teller Farm"); ok(!_.isEqual(a, b), "Arrays of identical lengths containing different elements are not equal"); // Sparse arrays. ok(_.isEqual(Array(3), Array(3)), "Sparse arrays of identical lengths are equal"); ok(!_.isEqual(Array(3), Array(6)), "Sparse arrays of different lengths are not equal when both are empty"); // Simple objects. ok(_.isEqual({a: "Curly", b: 1, c: true}, {a: "Curly", b: 1, c: true}), "Objects containing identical primitives are equal"); ok(_.isEqual({a: /Curly/g, b: new Date(2009, 11, 13)}, {a: /Curly/g, b: new Date(2009, 11, 13)}), "Objects containing equivalent members are equal"); ok(!_.isEqual({a: 63, b: 75}, {a: 61, b: 55}), "Objects of identical sizes with different values are not equal"); ok(!_.isEqual({a: 63, b: 75}, {a: 61, c: 55}), "Objects of identical sizes with different property names are not equal"); ok(!_.isEqual({a: 1, b: 2}, {a: 1}), "Objects of different sizes are not equal"); ok(!_.isEqual({a: 1}, {a: 1, b: 2}), "Commutative equality is implemented for objects"); ok(!_.isEqual({x: 1, y: undefined}, {x: 1, z: 2}), "Objects with identical keys and different values are not equivalent"); // `A` contains nested objects and arrays. a = { name: new String("Moe Howard"), age: new Number(77), stooge: true, hobbies: ["acting"], film: { name: "Sing a Song of Six Pants", release: new Date(1947, 9, 30), stars: [new String("Larry Fine"), "Shemp Howard"], minutes: new Number(16), seconds: 54 } }; // `B` contains equivalent nested objects and arrays. b = { name: new String("Moe Howard"), age: new Number(77), stooge: true, hobbies: ["acting"], film: { name: "Sing a Song of Six Pants", release: new Date(1947, 9, 30), stars: [new String("Larry Fine"), "Shemp Howard"], minutes: new Number(16), seconds: 54 } }; ok(_.isEqual(a, b), "Objects with nested equivalent members are recursively compared"); // Instances. ok(_.isEqual(new First, new First), "Object instances are equal"); ok(!_.isEqual(new First, new Second), "Objects with different constructors and identical own properties are not equal"); ok(!_.isEqual({value: 1}, new First), "Object instances and objects sharing equivalent properties are not equal"); ok(!_.isEqual({value: 2}, new Second), "The prototype chain of objects should not be examined"); // Circular Arrays. (a = []).push(a); (b = []).push(b); ok(_.isEqual(a, b), "Arrays containing circular references are equal"); a.push(new String("Larry")); b.push(new String("Larry")); ok(_.isEqual(a, b), "Arrays containing circular references and equivalent properties are equal"); a.push("Shemp"); b.push("Curly"); ok(!_.isEqual(a, b), "Arrays containing circular references and different properties are not equal"); // More circular arrays #767. a = ["everything is checked but", "this", "is not"]; a[1] = a; b = ["everything is checked but", ["this", "array"], "is not"]; ok(!_.isEqual(a, b), "Comparison of circular references with non-circular references are not equal"); // Circular Objects. a = {abc: null}; b = {abc: null}; a.abc = a; b.abc = b; ok(_.isEqual(a, b), "Objects containing circular references are equal"); a.def = 75; b.def = 75; ok(_.isEqual(a, b), "Objects containing circular references and equivalent properties are equal"); a.def = new Number(75); b.def = new Number(63); ok(!_.isEqual(a, b), "Objects containing circular references and different properties are not equal"); // More circular objects #767. a = {everything: "is checked", but: "this", is: "not"}; a.but = a; b = {everything: "is checked", but: {that:"object"}, is: "not"}; ok(!_.isEqual(a, b), "Comparison of circular references with non-circular object references are not equal"); // Cyclic Structures. a = [{abc: null}]; b = [{abc: null}]; (a[0].abc = a).push(a); (b[0].abc = b).push(b); ok(_.isEqual(a, b), "Cyclic structures are equal"); a[0].def = "Larry"; b[0].def = "Larry"; ok(_.isEqual(a, b), "Cyclic structures containing equivalent properties are equal"); a[0].def = new String("Larry"); b[0].def = new String("Curly"); ok(!_.isEqual(a, b), "Cyclic structures containing different properties are not equal"); // Complex Circular References. a = {foo: {b: {foo: {c: {foo: null}}}}}; b = {foo: {b: {foo: {c: {foo: null}}}}}; a.foo.b.foo.c.foo = a; b.foo.b.foo.c.foo = b; ok(_.isEqual(a, b), "Cyclic structures with nested and identically-named properties are equal"); // Chaining. ok(!_.isEqual(_({x: 1, y: undefined}).chain(), _({x: 1, z: 2}).chain()), 'Chained objects containing different values are not equal'); a = _({x: 1, y: 2}).chain(); b = _({x: 1, y: 2}).chain(); equal(_.isEqual(a.isEqual(b), _(true)), true, '`isEqual` can be chained'); // Objects from another frame. ok(_.isEqual({}, iObject)); }); test("isEmpty", function() { ok(!_([1]).isEmpty(), '[1] is not empty'); ok(_.isEmpty([]), '[] is empty'); ok(!_.isEmpty({one : 1}), '{one : 1} is not empty'); ok(_.isEmpty({}), '{} is empty'); ok(_.isEmpty(new RegExp('')), 'objects with prototype properties are empty'); ok(_.isEmpty(null), 'null is empty'); ok(_.isEmpty(), 'undefined is empty'); ok(_.isEmpty(''), 'the empty string is empty'); ok(!_.isEmpty('moe'), 'but other strings are not'); var obj = {one : 1}; delete obj.one; ok(_.isEmpty(obj), 'deleting all the keys from an object empties it'); }); // Setup remote variables for iFrame tests. var iframe = document.createElement('iframe'); jQuery(iframe).appendTo(document.body); var iDoc = iframe.contentDocument || iframe.contentWindow.document; iDoc.write( "" ); iDoc.close(); test("isElement", function() { ok(!_.isElement('div'), 'strings are not dom elements'); ok(_.isElement($('html')[0]), 'the html tag is a DOM element'); ok(_.isElement(iElement), 'even from another frame'); }); test("isArguments", function() { var args = (function(){ return arguments; })(1, 2, 3); ok(!_.isArguments('string'), 'a string is not an arguments object'); ok(!_.isArguments(_.isArguments), 'a function is not an arguments object'); ok(_.isArguments(args), 'but the arguments object is an arguments object'); ok(!_.isArguments(_.toArray(args)), 'but not when it\'s converted into an array'); ok(!_.isArguments([1,2,3]), 'and not vanilla arrays.'); ok(_.isArguments(iArguments), 'even from another frame'); }); test("isObject", function() { ok(_.isObject(arguments), 'the arguments object is object'); ok(_.isObject([1, 2, 3]), 'and arrays'); ok(_.isObject($('html')[0]), 'and DOM element'); ok(_.isObject(iElement), 'even from another frame'); ok(_.isObject(function () {}), 'and functions'); ok(_.isObject(iFunction), 'even from another frame'); ok(!_.isObject(null), 'but not null'); ok(!_.isObject(undefined), 'and not undefined'); ok(!_.isObject('string'), 'and not string'); ok(!_.isObject(12), 'and not number'); ok(!_.isObject(true), 'and not boolean'); ok(_.isObject(new String('string')), 'but new String()'); }); test("isArray", function() { ok(!_.isArray(undefined), 'undefined vars are not arrays'); ok(!_.isArray(arguments), 'the arguments object is not an array'); ok(_.isArray([1, 2, 3]), 'but arrays are'); ok(_.isArray(iArray), 'even from another frame'); }); test("isString", function() { var obj = new String("I am a string object"); ok(!_.isString(document.body), 'the document body is not a string'); ok(_.isString([1, 2, 3].join(', ')), 'but strings are'); ok(_.isString(iString), 'even from another frame'); ok(_.isString("I am a string literal"), 'string literals are'); ok(_.isString(obj), 'so are String objects'); }); test("isNumber", function() { ok(!_.isNumber('string'), 'a string is not a number'); ok(!_.isNumber(arguments), 'the arguments object is not a number'); ok(!_.isNumber(undefined), 'undefined is not a number'); ok(_.isNumber(3 * 4 - 7 / 10), 'but numbers are'); ok(_.isNumber(NaN), 'NaN *is* a number'); ok(_.isNumber(Infinity), 'Infinity is a number'); ok(_.isNumber(iNumber), 'even from another frame'); ok(!_.isNumber('1'), 'numeric strings are not numbers'); }); test("isBoolean", function() { ok(!_.isBoolean(2), 'a number is not a boolean'); ok(!_.isBoolean("string"), 'a string is not a boolean'); ok(!_.isBoolean("false"), 'the string "false" is not a boolean'); ok(!_.isBoolean("true"), 'the string "true" is not a boolean'); ok(!_.isBoolean(arguments), 'the arguments object is not a boolean'); ok(!_.isBoolean(undefined), 'undefined is not a boolean'); ok(!_.isBoolean(NaN), 'NaN is not a boolean'); ok(!_.isBoolean(null), 'null is not a boolean'); ok(_.isBoolean(true), 'but true is'); ok(_.isBoolean(false), 'and so is false'); ok(_.isBoolean(iBoolean), 'even from another frame'); }); test("isFunction", function() { ok(!_.isFunction(undefined), 'undefined vars are not functions'); ok(!_.isFunction([1, 2, 3]), 'arrays are not functions'); ok(!_.isFunction('moe'), 'strings are not functions'); ok(_.isFunction(_.isFunction), 'but functions are'); ok(_.isFunction(iFunction), 'even from another frame'); ok(_.isFunction(function(){}), 'even anonymous ones'); }); test("isDate", function() { ok(!_.isDate(100), 'numbers are not dates'); ok(!_.isDate({}), 'objects are not dates'); ok(_.isDate(new Date()), 'but dates are'); ok(_.isDate(iDate), 'even from another frame'); }); test("isRegExp", function() { ok(!_.isRegExp(_.identity), 'functions are not RegExps'); ok(_.isRegExp(/identity/), 'but RegExps are'); ok(_.isRegExp(iRegExp), 'even from another frame'); }); test("isFinite", function() { ok(!_.isFinite(undefined), 'undefined is not Finite'); ok(!_.isFinite(null), 'null is not Finite'); ok(!_.isFinite(NaN), 'NaN is not Finite'); ok(!_.isFinite(Infinity), 'Infinity is not Finite'); ok(!_.isFinite(-Infinity), '-Infinity is not Finite'); ok(_.isFinite('12'), 'Numeric strings are numbers'); ok(!_.isFinite('1a'), 'Non numeric strings are not numbers'); ok(!_.isFinite(''), 'Empty strings are not numbers'); var obj = new Number(5); ok(_.isFinite(obj), 'Number instances can be finite'); ok(_.isFinite(0), '0 is Finite'); ok(_.isFinite(123), 'Ints are Finite'); ok(_.isFinite(-12.44), 'Floats are Finite'); }); test("isNaN", function() { ok(!_.isNaN(undefined), 'undefined is not NaN'); ok(!_.isNaN(null), 'null is not NaN'); ok(!_.isNaN(0), '0 is not NaN'); ok(_.isNaN(NaN), 'but NaN is'); ok(_.isNaN(iNaN), 'even from another frame'); ok(_.isNaN(new Number(NaN)), 'wrapped NaN is still NaN'); }); test("isNull", function() { ok(!_.isNull(undefined), 'undefined is not null'); ok(!_.isNull(NaN), 'NaN is not null'); ok(_.isNull(null), 'but null is'); ok(_.isNull(iNull), 'even from another frame'); }); test("isUndefined", function() { ok(!_.isUndefined(1), 'numbers are defined'); ok(!_.isUndefined(null), 'null is defined'); ok(!_.isUndefined(false), 'false is defined'); ok(!_.isUndefined(NaN), 'NaN is defined'); ok(_.isUndefined(), 'nothing is undefined'); ok(_.isUndefined(undefined), 'undefined is undefined'); ok(_.isUndefined(iUndefined), 'even from another frame'); }); if (window.ActiveXObject) { test("IE host objects", function() { var xml = new ActiveXObject("Msxml2.DOMDocument.3.0"); ok(!_.isNumber(xml)); ok(!_.isBoolean(xml)); ok(!_.isNaN(xml)); ok(!_.isFunction(xml)); ok(!_.isNull(xml)); ok(!_.isUndefined(xml)); }); } test("tap", function() { var intercepted = null; var interceptor = function(obj) { intercepted = obj; }; var returned = _.tap(1, interceptor); equal(intercepted, 1, "passes tapped object to interceptor"); equal(returned, 1, "returns tapped object"); returned = _([1,2,3]).chain(). map(function(n){ return n * 2; }). max(). tap(interceptor). value(); ok(returned == 6 && intercepted == 6, 'can use tapped objects in a chain'); }); test("has", function () { var obj = {foo: "bar", func: function () {} }; ok (_.has(obj, "foo"), "has() checks that the object has a property."); ok (_.has(obj, "baz") == false, "has() returns false if the object doesn't have the property."); ok (_.has(obj, "func"), "has() works for functions too."); obj.hasOwnProperty = null; ok (_.has(obj, "foo"), "has() works even when the hasOwnProperty method is deleted."); var child = {}; child.prototype = obj; ok (_.has(child, "foo") == false, "has() does not check the prototype chain for a property.") }); });