deno.land / x / lodash@4.17.19 / vendor / underscore / test / arrays.js
نووسراو ببینە
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564(function() { var _ = typeof require == 'function' ? require('..') : window._;
QUnit.module('Arrays');
QUnit.test('first', function(assert) { assert.equal(_.first([1, 2, 3]), 1, 'can pull out the first element of an array'); assert.equal(_([1, 2, 3]).first(), 1, 'can perform OO-style "first()"'); assert.deepEqual(_.first([1, 2, 3], 0), [], 'returns an empty array when n <= 0 (0 case)'); assert.deepEqual(_.first([1, 2, 3], -1), [], 'returns an empty array when n <= 0 (negative case)'); assert.deepEqual(_.first([1, 2, 3], 2), [1, 2], 'can fetch the first n elements'); assert.deepEqual(_.first([1, 2, 3], 5), [1, 2, 3], 'returns the whole array if n > length'); var result = (function(){ return _.first(arguments); }(4, 3, 2, 1)); assert.equal(result, 4, 'works on an arguments object'); result = _.map([[1, 2, 3], [1, 2, 3]], _.first); assert.deepEqual(result, [1, 1], 'works well with _.map'); assert.equal(_.first(null), void 0, 'returns undefined when called on null');
Array.prototype[0] = 'boo'; assert.equal(_.first([]), void 0, 'return undefined when called on a empty array'); delete Array.prototype[0]; });
QUnit.test('head', function(assert) { assert.strictEqual(_.head, _.first, 'is an alias for first'); });
QUnit.test('take', function(assert) { assert.strictEqual(_.take, _.first, 'is an alias for first'); });
QUnit.test('rest', function(assert) { var numbers = [1, 2, 3, 4]; assert.deepEqual(_.rest(numbers), [2, 3, 4], 'fetches all but the first element'); assert.deepEqual(_.rest(numbers, 0), [1, 2, 3, 4], 'returns the whole array when index is 0'); assert.deepEqual(_.rest(numbers, 2), [3, 4], 'returns elements starting at the given index'); var result = (function(){ return _(arguments).rest(); }(1, 2, 3, 4)); assert.deepEqual(result, [2, 3, 4], 'works on an arguments object'); result = _.map([[1, 2, 3], [1, 2, 3]], _.rest); assert.deepEqual(_.flatten(result), [2, 3, 2, 3], 'works well with _.map'); });
QUnit.test('tail', function(assert) { assert.strictEqual(_.tail, _.rest, 'is an alias for rest'); });
QUnit.test('drop', function(assert) { assert.strictEqual(_.drop, _.rest, 'is an alias for rest'); });
QUnit.test('initial', function(assert) { assert.deepEqual(_.initial([1, 2, 3, 4, 5]), [1, 2, 3, 4], 'returns all but the last element'); assert.deepEqual(_.initial([1, 2, 3, 4], 2), [1, 2], 'returns all but the last n elements'); assert.deepEqual(_.initial([1, 2, 3, 4], 6), [], 'returns an empty array when n > length'); var result = (function(){ return _(arguments).initial(); }(1, 2, 3, 4)); assert.deepEqual(result, [1, 2, 3], 'works on an arguments object'); result = _.map([[1, 2, 3], [1, 2, 3]], _.initial); assert.deepEqual(_.flatten(result), [1, 2, 1, 2], 'works well with _.map'); });
QUnit.test('last', function(assert) { assert.equal(_.last([1, 2, 3]), 3, 'can pull out the last element of an array'); assert.equal(_([1, 2, 3]).last(), 3, 'can perform OO-style "last()"'); assert.deepEqual(_.last([1, 2, 3], 0), [], 'returns an empty array when n <= 0 (0 case)'); assert.deepEqual(_.last([1, 2, 3], -1), [], 'returns an empty array when n <= 0 (negative case)'); assert.deepEqual(_.last([1, 2, 3], 2), [2, 3], 'can fetch the last n elements'); assert.deepEqual(_.last([1, 2, 3], 5), [1, 2, 3], 'returns the whole array if n > length'); var result = (function(){ return _(arguments).last(); }(1, 2, 3, 4)); assert.equal(result, 4, 'works on an arguments object'); result = _.map([[1, 2, 3], [1, 2, 3]], _.last); assert.deepEqual(result, [3, 3], 'works well with _.map'); assert.equal(_.last(null), void 0, 'returns undefined when called on null');
var arr = []; arr[-1] = 'boo'; assert.equal(_.last(arr), void 0, 'return undefined when called on a empty array'); });
QUnit.test('compact', function(assert) { assert.deepEqual(_.compact([1, false, null, 0, '', void 0, NaN, 2]), [1, 2], 'removes all falsy values'); var result = (function(){ return _.compact(arguments); }(0, 1, false, 2, false, 3)); assert.deepEqual(result, [1, 2, 3], 'works on an arguments object'); result = _.map([[1, false, false], [false, false, 3]], _.compact); assert.deepEqual(result, [[1], [3]], 'works well with _.map'); });
QUnit.test('flatten', function(assert) { assert.deepEqual(_.flatten(null), [], 'supports null'); assert.deepEqual(_.flatten(void 0), [], 'supports undefined');
assert.deepEqual(_.flatten([[], [[]], []]), [], 'supports empty arrays'); assert.deepEqual(_.flatten([[], [[]], []], true), [[]], 'can shallowly flatten empty arrays');
var list = [1, [2], [3, [[[4]]]]]; assert.deepEqual(_.flatten(list), [1, 2, 3, 4], 'can flatten nested arrays'); assert.deepEqual(_.flatten(list, true), [1, 2, 3, [[[4]]]], 'can shallowly flatten nested arrays'); var result = (function(){ return _.flatten(arguments); }(1, [2], [3, [[[4]]]])); assert.deepEqual(result, [1, 2, 3, 4], 'works on an arguments object'); list = [[1], [2], [3], [[4]]]; assert.deepEqual(_.flatten(list, true), [1, 2, 3, [4]], 'can shallowly flatten arrays containing only other arrays');
assert.equal(_.flatten([_.range(10), _.range(10), 5, 1, 3], true).length, 23, 'can flatten medium length arrays'); assert.equal(_.flatten([_.range(10), _.range(10), 5, 1, 3]).length, 23, 'can shallowly flatten medium length arrays'); assert.equal(_.flatten([new Array(1000000), _.range(56000), 5, 1, 3]).length, 1056003, 'can handle massive arrays'); assert.equal(_.flatten([new Array(1000000), _.range(56000), 5, 1, 3], true).length, 1056003, 'can handle massive arrays in shallow mode');
var x = _.range(100000); for (var i = 0; i < 1000; i++) x = [x]; assert.deepEqual(_.flatten(x), _.range(100000), 'can handle very deep arrays'); assert.deepEqual(_.flatten(x, true), x[0], 'can handle very deep arrays in shallow mode'); });
QUnit.test('without', function(assert) { var list = [1, 2, 1, 0, 3, 1, 4]; assert.deepEqual(_.without(list, 0, 1), [2, 3, 4], 'removes all instances of the given values'); var result = (function(){ return _.without(arguments, 0, 1); }(1, 2, 1, 0, 3, 1, 4)); assert.deepEqual(result, [2, 3, 4], 'works on an arguments object');
list = [{one: 1}, {two: 2}]; assert.deepEqual(_.without(list, {one: 1}), list, 'compares objects by reference (value case)'); assert.deepEqual(_.without(list, list[0]), [{two: 2}], 'compares objects by reference (reference case)'); });
QUnit.test('sortedIndex', function(assert) { var numbers = [10, 20, 30, 40, 50]; var indexFor35 = _.sortedIndex(numbers, 35); assert.equal(indexFor35, 3, 'finds the index at which a value should be inserted to retain order'); var indexFor30 = _.sortedIndex(numbers, 30); assert.equal(indexFor30, 2, 'finds the smallest index at which a value could be inserted to retain order');
var objects = [{x: 10}, {x: 20}, {x: 30}, {x: 40}]; var iterator = function(obj){ return obj.x; }; assert.strictEqual(_.sortedIndex(objects, {x: 25}, iterator), 2, 'uses the result of `iterator` for order comparisons'); assert.strictEqual(_.sortedIndex(objects, {x: 35}, 'x'), 3, 'when `iterator` is a string, uses that key for order comparisons');
var context = {1: 2, 2: 3, 3: 4}; iterator = function(obj){ return this[obj]; }; assert.strictEqual(_.sortedIndex([1, 3], 2, iterator, context), 1, 'can execute its iterator in the given context');
var values = [0, 1, 3, 7, 15, 31, 63, 127, 255, 511, 1023, 2047, 4095, 8191, 16383, 32767, 65535, 131071, 262143, 524287, 1048575, 2097151, 4194303, 8388607, 16777215, 33554431, 67108863, 134217727, 268435455, 536870911, 1073741823, 2147483647]; var largeArray = Array(Math.pow(2, 32) - 1); var length = values.length; // Sparsely populate `array` while (length--) { largeArray[values[length]] = values[length]; } assert.equal(_.sortedIndex(largeArray, 2147483648), 2147483648, 'works with large indexes'); });
QUnit.test('uniq', function(assert) { var list = [1, 2, 1, 3, 1, 4]; assert.deepEqual(_.uniq(list), [1, 2, 3, 4], 'can find the unique values of an unsorted array'); list = [1, 1, 1, 2, 2, 3]; assert.deepEqual(_.uniq(list, true), [1, 2, 3], 'can find the unique values of a sorted array faster');
list = [{name: 'Moe'}, {name: 'Curly'}, {name: 'Larry'}, {name: 'Curly'}]; var expected = [{name: 'Moe'}, {name: 'Curly'}, {name: 'Larry'}]; var iterator = function(stooge) { return stooge.name; }; assert.deepEqual(_.uniq(list, false, iterator), expected, 'uses the result of `iterator` for uniqueness comparisons (unsorted case)'); assert.deepEqual(_.uniq(list, iterator), expected, '`sorted` argument defaults to false when omitted'); assert.deepEqual(_.uniq(list, 'name'), expected, 'when `iterator` is a string, uses that key for comparisons (unsorted case)');
list = [{score: 8}, {score: 10}, {score: 10}]; expected = [{score: 8}, {score: 10}]; iterator = function(item) { return item.score; }; assert.deepEqual(_.uniq(list, true, iterator), expected, 'uses the result of `iterator` for uniqueness comparisons (sorted case)'); assert.deepEqual(_.uniq(list, true, 'score'), expected, 'when `iterator` is a string, uses that key for comparisons (sorted case)');
assert.deepEqual(_.uniq([{0: 1}, {0: 1}, {0: 1}, {0: 2}], 0), [{0: 1}, {0: 2}], 'can use falsey pluck like iterator');
var result = (function(){ return _.uniq(arguments); }(1, 2, 1, 3, 1, 4)); assert.deepEqual(result, [1, 2, 3, 4], 'works on an arguments object');
var a = {}, b = {}, c = {}; assert.deepEqual(_.uniq([a, b, a, b, c]), [a, b, c], 'works on values that can be tested for equivalency but not ordered');
assert.deepEqual(_.uniq(null), [], 'returns an empty array when `array` is not iterable');
var context = {}; list = [3]; _.uniq(list, function(value, index, array) { assert.strictEqual(this, context, 'executes its iterator in the given context'); assert.strictEqual(value, 3, 'passes its iterator the value'); assert.strictEqual(index, 0, 'passes its iterator the index'); assert.strictEqual(array, list, 'passes its iterator the entire array'); }, context);
});
QUnit.test('unique', function(assert) { assert.strictEqual(_.unique, _.uniq, 'is an alias for uniq'); });
QUnit.test('intersection', function(assert) { var stooges = ['moe', 'curly', 'larry'], leaders = ['moe', 'groucho']; assert.deepEqual(_.intersection(stooges, leaders), ['moe'], 'can find the set intersection of two arrays'); assert.deepEqual(_(stooges).intersection(leaders), ['moe'], 'can perform an OO-style intersection'); var result = (function(){ return _.intersection(arguments, leaders); }('moe', 'curly', 'larry')); assert.deepEqual(result, ['moe'], 'works on an arguments object'); var theSixStooges = ['moe', 'moe', 'curly', 'curly', 'larry', 'larry']; assert.deepEqual(_.intersection(theSixStooges, leaders), ['moe'], 'returns a duplicate-free array'); result = _.intersection([2, 4, 3, 1], [1, 2, 3]); assert.deepEqual(result, [2, 3, 1], 'preserves the order of the first array'); result = _.intersection(null, [1, 2, 3]); assert.deepEqual(result, [], 'returns an empty array when passed null as the first argument'); result = _.intersection([1, 2, 3], null); assert.deepEqual(result, [], 'returns an empty array when passed null as an argument beyond the first'); });
QUnit.test('union', function(assert) { var result = _.union([1, 2, 3], [2, 30, 1], [1, 40]); assert.deepEqual(result, [1, 2, 3, 30, 40], 'can find the union of a list of arrays');
result = _([1, 2, 3]).union([2, 30, 1], [1, 40]); assert.deepEqual(result, [1, 2, 3, 30, 40], 'can perform an OO-style union');
result = _.union([1, 2, 3], [2, 30, 1], [1, 40, [1]]); assert.deepEqual(result, [1, 2, 3, 30, 40, [1]], 'can find the union of a list of nested arrays');
result = _.union([10, 20], [1, 30, 10], [0, 40]); assert.deepEqual(result, [10, 20, 1, 30, 0, 40], 'orders values by their first encounter');
result = (function(){ return _.union(arguments, [2, 30, 1], [1, 40]); }(1, 2, 3)); assert.deepEqual(result, [1, 2, 3, 30, 40], 'works on an arguments object');
assert.deepEqual(_.union([1, 2, 3], 4), [1, 2, 3], 'restricts the union to arrays only'); });
QUnit.test('difference', function(assert) { var result = _.difference([1, 2, 3], [2, 30, 40]); assert.deepEqual(result, [1, 3], 'can find the difference of two arrays');
result = _([1, 2, 3]).difference([2, 30, 40]); assert.deepEqual(result, [1, 3], 'can perform an OO-style difference');
result = _.difference([1, 2, 3, 4], [2, 30, 40], [1, 11, 111]); assert.deepEqual(result, [3, 4], 'can find the difference of three arrays');
result = _.difference([8, 9, 3, 1], [3, 8]); assert.deepEqual(result, [9, 1], 'preserves the order of the first array');
result = (function(){ return _.difference(arguments, [2, 30, 40]); }(1, 2, 3)); assert.deepEqual(result, [1, 3], 'works on an arguments object');
result = _.difference([1, 2, 3], 1); assert.deepEqual(result, [1, 2, 3], 'restrict the difference to arrays only'); });
QUnit.test('zip', function(assert) { var names = ['moe', 'larry', 'curly'], ages = [30, 40, 50], leaders = [true]; assert.deepEqual(_.zip(names, ages, leaders), [ ['moe', 30, true], ['larry', 40, void 0], ['curly', 50, void 0] ], 'zipped together arrays of different lengths');
var stooges = _.zip(['moe', 30, 'stooge 1'], ['larry', 40, 'stooge 2'], ['curly', 50, 'stooge 3']); assert.deepEqual(stooges, [['moe', 'larry', 'curly'], [30, 40, 50], ['stooge 1', 'stooge 2', 'stooge 3']], 'zipped pairs');
// In the case of different lengths of the tuples, undefined values // should be used as placeholder stooges = _.zip(['moe', 30], ['larry', 40], ['curly', 50, 'extra data']); assert.deepEqual(stooges, [['moe', 'larry', 'curly'], [30, 40, 50], [void 0, void 0, 'extra data']], 'zipped pairs with empties');
var empty = _.zip([]); assert.deepEqual(empty, [], 'unzipped empty');
assert.deepEqual(_.zip(null), [], 'handles null'); assert.deepEqual(_.zip(), [], '_.zip() returns []'); });
QUnit.test('unzip', function(assert) { assert.deepEqual(_.unzip(null), [], 'handles null');
assert.deepEqual(_.unzip([['a', 'b'], [1, 2]]), [['a', 1], ['b', 2]]);
// complements zip var zipped = _.zip(['fred', 'barney'], [30, 40], [true, false]); assert.deepEqual(_.unzip(zipped), [['fred', 'barney'], [30, 40], [true, false]]);
zipped = _.zip(['moe', 30], ['larry', 40], ['curly', 50, 'extra data']); assert.deepEqual(_.unzip(zipped), [['moe', 30, void 0], ['larry', 40, void 0], ['curly', 50, 'extra data']], 'Uses length of largest array'); });
QUnit.test('object', function(assert) { var result = _.object(['moe', 'larry', 'curly'], [30, 40, 50]); var shouldBe = {moe: 30, larry: 40, curly: 50}; assert.deepEqual(result, shouldBe, 'two arrays zipped together into an object');
result = _.object([['one', 1], ['two', 2], ['three', 3]]); shouldBe = {one: 1, two: 2, three: 3}; assert.deepEqual(result, shouldBe, 'an array of pairs zipped together into an object');
var stooges = {moe: 30, larry: 40, curly: 50}; assert.deepEqual(_.object(_.pairs(stooges)), stooges, 'an object converted to pairs and back to an object');
assert.deepEqual(_.object(null), {}, 'handles nulls'); });
QUnit.test('indexOf', function(assert) { var numbers = [1, 2, 3]; assert.equal(_.indexOf(numbers, 2), 1, 'can compute indexOf'); var result = (function(){ return _.indexOf(arguments, 2); }(1, 2, 3)); assert.equal(result, 1, 'works on an arguments object');
_.each([null, void 0, [], false], function(val) { var msg = 'Handles: ' + (_.isArray(val) ? '[]' : val); assert.equal(_.indexOf(val, 2), -1, msg); assert.equal(_.indexOf(val, 2, -1), -1, msg); assert.equal(_.indexOf(val, 2, -20), -1, msg); assert.equal(_.indexOf(val, 2, 15), -1, msg); });
var num = 35; numbers = [10, 20, 30, 40, 50]; var index = _.indexOf(numbers, num, true); assert.equal(index, -1, '35 is not in the list');
numbers = [10, 20, 30, 40, 50]; num = 40; index = _.indexOf(numbers, num, true); assert.equal(index, 3, '40 is in the list');
numbers = [1, 40, 40, 40, 40, 40, 40, 40, 50, 60, 70]; num = 40; assert.equal(_.indexOf(numbers, num, true), 1, '40 is in the list'); assert.equal(_.indexOf(numbers, 6, true), -1, '6 isnt in the list'); assert.equal(_.indexOf([1, 2, 5, 4, 6, 7], 5, true), -1, 'sorted indexOf doesn\'t uses binary search'); assert.ok(_.every(['1', [], {}, null], function() { return _.indexOf(numbers, num, {}) === 1; }), 'non-nums as fromIndex make indexOf assume sorted');
numbers = [1, 2, 3, 1, 2, 3, 1, 2, 3]; index = _.indexOf(numbers, 2, 5); assert.equal(index, 7, 'supports the fromIndex argument');
index = _.indexOf([,,, 0], void 0); assert.equal(index, 0, 'treats sparse arrays as if they were dense');
var array = [1, 2, 3, 1, 2, 3]; assert.strictEqual(_.indexOf(array, 1, -3), 3, 'neg `fromIndex` starts at the right index'); assert.strictEqual(_.indexOf(array, 1, -2), -1, 'neg `fromIndex` starts at the right index'); assert.strictEqual(_.indexOf(array, 2, -3), 4); _.each([-6, -8, -Infinity], function(fromIndex) { assert.strictEqual(_.indexOf(array, 1, fromIndex), 0); }); assert.strictEqual(_.indexOf([1, 2, 3], 1, true), 0);
index = _.indexOf([], void 0, true); assert.equal(index, -1, 'empty array with truthy `isSorted` returns -1'); });
QUnit.test('indexOf with NaN', function(assert) { assert.strictEqual(_.indexOf([1, 2, NaN, NaN], NaN), 2, 'Expected [1, 2, NaN] to contain NaN'); assert.strictEqual(_.indexOf([1, 2, Infinity], NaN), -1, 'Expected [1, 2, NaN] to contain NaN');
assert.strictEqual(_.indexOf([1, 2, NaN, NaN], NaN, 1), 2, 'startIndex does not affect result'); assert.strictEqual(_.indexOf([1, 2, NaN, NaN], NaN, -2), 2, 'startIndex does not affect result');
(function() { assert.strictEqual(_.indexOf(arguments, NaN), 2, 'Expected arguments [1, 2, NaN] to contain NaN'); }(1, 2, NaN, NaN)); });
QUnit.test('indexOf with +- 0', function(assert) { _.each([-0, +0], function(val) { assert.strictEqual(_.indexOf([1, 2, val, val], val), 2); assert.strictEqual(_.indexOf([1, 2, val, val], -val), 2); }); });
QUnit.test('lastIndexOf', function(assert) { var numbers = [1, 0, 1]; var falsey = [void 0, '', 0, false, NaN, null, void 0]; assert.equal(_.lastIndexOf(numbers, 1), 2);
numbers = [1, 0, 1, 0, 0, 1, 0, 0, 0]; numbers.lastIndexOf = null; assert.equal(_.lastIndexOf(numbers, 1), 5, 'can compute lastIndexOf, even without the native function'); assert.equal(_.lastIndexOf(numbers, 0), 8, 'lastIndexOf the other element'); var result = (function(){ return _.lastIndexOf(arguments, 1); }(1, 0, 1, 0, 0, 1, 0, 0, 0)); assert.equal(result, 5, 'works on an arguments object');
_.each([null, void 0, [], false], function(val) { var msg = 'Handles: ' + (_.isArray(val) ? '[]' : val); assert.equal(_.lastIndexOf(val, 2), -1, msg); assert.equal(_.lastIndexOf(val, 2, -1), -1, msg); assert.equal(_.lastIndexOf(val, 2, -20), -1, msg); assert.equal(_.lastIndexOf(val, 2, 15), -1, msg); });
numbers = [1, 2, 3, 1, 2, 3, 1, 2, 3]; var index = _.lastIndexOf(numbers, 2, 2); assert.equal(index, 1, 'supports the fromIndex argument');
var array = [1, 2, 3, 1, 2, 3];
assert.strictEqual(_.lastIndexOf(array, 1, 0), 0, 'starts at the correct from idx'); assert.strictEqual(_.lastIndexOf(array, 3), 5, 'should return the index of the last matched value'); assert.strictEqual(_.lastIndexOf(array, 4), -1, 'should return `-1` for an unmatched value');
assert.strictEqual(_.lastIndexOf(array, 1, 2), 0, 'should work with a positive `fromIndex`');
_.each([6, 8, Math.pow(2, 32), Infinity], function(fromIndex) { assert.strictEqual(_.lastIndexOf(array, void 0, fromIndex), -1); assert.strictEqual(_.lastIndexOf(array, 1, fromIndex), 3); assert.strictEqual(_.lastIndexOf(array, '', fromIndex), -1); });
var expected = _.map(falsey, function(value) { return typeof value == 'number' ? -1 : 5; });
var actual = _.map(falsey, function(fromIndex) { return _.lastIndexOf(array, 3, fromIndex); });
assert.deepEqual(actual, expected, 'should treat falsey `fromIndex` values, except `0` and `NaN`, as `array.length`'); assert.strictEqual(_.lastIndexOf(array, 3, '1'), 5, 'should treat non-number `fromIndex` values as `array.length`'); assert.strictEqual(_.lastIndexOf(array, 3, true), 5, 'should treat non-number `fromIndex` values as `array.length`');
assert.strictEqual(_.lastIndexOf(array, 2, -3), 1, 'should work with a negative `fromIndex`'); assert.strictEqual(_.lastIndexOf(array, 1, -3), 3, 'neg `fromIndex` starts at the right index');
assert.deepEqual(_.map([-6, -8, -Infinity], function(fromIndex) { return _.lastIndexOf(array, 1, fromIndex); }), [0, -1, -1]); });
QUnit.test('lastIndexOf with NaN', function(assert) { assert.strictEqual(_.lastIndexOf([1, 2, NaN, NaN], NaN), 3, 'Expected [1, 2, NaN] to contain NaN'); assert.strictEqual(_.lastIndexOf([1, 2, Infinity], NaN), -1, 'Expected [1, 2, NaN] to contain NaN');
assert.strictEqual(_.lastIndexOf([1, 2, NaN, NaN], NaN, 2), 2, 'fromIndex does not affect result'); assert.strictEqual(_.lastIndexOf([1, 2, NaN, NaN], NaN, -2), 2, 'fromIndex does not affect result');
(function() { assert.strictEqual(_.lastIndexOf(arguments, NaN), 3, 'Expected arguments [1, 2, NaN] to contain NaN'); }(1, 2, NaN, NaN)); });
QUnit.test('lastIndexOf with +- 0', function(assert) { _.each([-0, +0], function(val) { assert.strictEqual(_.lastIndexOf([1, 2, val, val], val), 3); assert.strictEqual(_.lastIndexOf([1, 2, val, val], -val), 3); assert.strictEqual(_.lastIndexOf([-1, 1, 2], -val), -1); }); });
QUnit.test('findIndex', function(assert) { var objects = [ {a: 0, b: 0}, {a: 1, b: 1}, {a: 2, b: 2}, {a: 0, b: 0} ];
assert.equal(_.findIndex(objects, function(obj) { return obj.a === 0; }), 0);
assert.equal(_.findIndex(objects, function(obj) { return obj.b * obj.a === 4; }), 2);
assert.equal(_.findIndex(objects, 'a'), 1, 'Uses lookupIterator');
assert.equal(_.findIndex(objects, function(obj) { return obj.b * obj.a === 5; }), -1);
assert.equal(_.findIndex(null, _.noop), -1); assert.strictEqual(_.findIndex(objects, function(a) { return a.foo === null; }), -1); _.findIndex([{a: 1}], function(a, key, obj) { assert.equal(key, 0); assert.deepEqual(obj, [{a: 1}]); assert.strictEqual(this, objects, 'called with context'); }, objects);
var sparse = []; sparse[20] = {a: 2, b: 2}; assert.equal(_.findIndex(sparse, function(obj) { return obj && obj.b * obj.a === 4; }), 20, 'Works with sparse arrays');
var array = [1, 2, 3, 4]; array.match = 55; assert.strictEqual(_.findIndex(array, function(x) { return x === 55; }), -1, 'doesn\'t match array-likes keys'); });
QUnit.test('findLastIndex', function(assert) { var objects = [ {a: 0, b: 0}, {a: 1, b: 1}, {a: 2, b: 2}, {a: 0, b: 0} ];
assert.equal(_.findLastIndex(objects, function(obj) { return obj.a === 0; }), 3);
assert.equal(_.findLastIndex(objects, function(obj) { return obj.b * obj.a === 4; }), 2);
assert.equal(_.findLastIndex(objects, 'a'), 2, 'Uses lookupIterator');
assert.equal(_.findLastIndex(objects, function(obj) { return obj.b * obj.a === 5; }), -1);
assert.equal(_.findLastIndex(null, _.noop), -1); assert.strictEqual(_.findLastIndex(objects, function(a) { return a.foo === null; }), -1); _.findLastIndex([{a: 1}], function(a, key, obj) { assert.equal(key, 0); assert.deepEqual(obj, [{a: 1}]); assert.strictEqual(this, objects, 'called with context'); }, objects);
var sparse = []; sparse[20] = {a: 2, b: 2}; assert.equal(_.findLastIndex(sparse, function(obj) { return obj && obj.b * obj.a === 4; }), 20, 'Works with sparse arrays');
var array = [1, 2, 3, 4]; array.match = 55; assert.strictEqual(_.findLastIndex(array, function(x) { return x === 55; }), -1, 'doesn\'t match array-likes keys'); });
QUnit.test('range', function(assert) { assert.deepEqual(_.range(0), [], 'range with 0 as a first argument generates an empty array'); assert.deepEqual(_.range(4), [0, 1, 2, 3], 'range with a single positive argument generates an array of elements 0,1,2,...,n-1'); assert.deepEqual(_.range(5, 8), [5, 6, 7], 'range with two arguments a & b, a<b generates an array of elements a,a+1,a+2,...,b-2,b-1'); assert.deepEqual(_.range(3, 10, 3), [3, 6, 9], 'range with three arguments a & b & c, c < b-a, a < b generates an array of elements a,a+c,a+2c,...,b - (multiplier of a) < c'); assert.deepEqual(_.range(3, 10, 15), [3], 'range with three arguments a & b & c, c > b-a, a < b generates an array with a single element, equal to a'); assert.deepEqual(_.range(12, 7, -2), [12, 10, 8], 'range with three arguments a & b & c, a > b, c < 0 generates an array of elements a,a-c,a-2c and ends with the number not less than b'); assert.deepEqual(_.range(0, -10, -1), [0, -1, -2, -3, -4, -5, -6, -7, -8, -9], 'final example in the Python docs'); assert.strictEqual(1 / _.range(-0, 1)[0], -Infinity, 'should preserve -0'); assert.deepEqual(_.range(8, 5), [8, 7, 6], 'negative range generates descending array'); assert.deepEqual(_.range(-3), [0, -1, -2], 'negative range generates descending array'); });
QUnit.test('chunk', function(assert) { assert.deepEqual(_.chunk([], 2), [], 'chunk for empty array returns an empty array');
assert.deepEqual(_.chunk([1, 2, 3], 0), [], 'chunk into parts of 0 elements returns empty array'); assert.deepEqual(_.chunk([1, 2, 3], -1), [], 'chunk into parts of negative amount of elements returns an empty array'); assert.deepEqual(_.chunk([1, 2, 3]), [], 'defaults to empty array (chunk size 0)');
assert.deepEqual(_.chunk([1, 2, 3], 1), [[1], [2], [3]], 'chunk into parts of 1 elements returns original array');
assert.deepEqual(_.chunk([1, 2, 3], 3), [[1, 2, 3]], 'chunk into parts of current array length elements returns the original array'); assert.deepEqual(_.chunk([1, 2, 3], 5), [[1, 2, 3]], 'chunk into parts of more then current array length elements returns the original array');
assert.deepEqual(_.chunk([10, 20, 30, 40, 50, 60, 70], 2), [[10, 20], [30, 40], [50, 60], [70]], 'chunk into parts of less then current array length elements'); assert.deepEqual(_.chunk([10, 20, 30, 40, 50, 60, 70], 3), [[10, 20, 30], [40, 50, 60], [70]], 'chunk into parts of less then current array length elements'); });}());
lodash
Version Info
5 years ago
External Dependencies
No external dependencies 🎉
