1(function() { 2 var _ = typeof require == 'function' ? require('..') : window._; 3 4 QUnit.module('Chaining'); 5 6 QUnit.test('map/flatten/reduce', function(assert) { 7 var lyrics = [ 8 'I\'m a lumberjack and I\'m okay', 9 'I sleep all night and I work all day', 10 'He\'s a lumberjack and he\'s okay', 11 'He sleeps all night and he works all day' 12 ]; 13 var counts = _(lyrics).chain() 14 .map(function(line) { return line.split(''); }) 15 .flatten() 16 .reduce(function(hash, l) { 17 hash[l] = hash[l] || 0; 18 hash[l]++; 19 return hash; 20 }, {}) 21 .value(); 22 assert.equal(counts.a, 16, 'counted all the letters in the song'); 23 assert.equal(counts.e, 10, 'counted all the letters in the song'); 24 }); 25 26 QUnit.test('select/reject/sortBy', function(assert) { 27 var numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; 28 numbers = _(numbers).chain().select(function(n) { 29 return n % 2 === 0; 30 }).reject(function(n) { 31 return n % 4 === 0; 32 }).sortBy(function(n) { 33 return -n; 34 }).value(); 35 assert.deepEqual(numbers, [10, 6, 2], 'filtered and reversed the numbers'); 36 }); 37 38 QUnit.test('select/reject/sortBy in functional style', function(assert) { 39 var numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; 40 numbers = _.chain(numbers).select(function(n) { 41 return n % 2 === 0; 42 }).reject(function(n) { 43 return n % 4 === 0; 44 }).sortBy(function(n) { 45 return -n; 46 }).value(); 47 assert.deepEqual(numbers, [10, 6, 2], 'filtered and reversed the numbers'); 48 }); 49 50 QUnit.test('reverse/concat/unshift/pop/map', function(assert) { 51 var numbers = [1, 2, 3, 4, 5]; 52 numbers = _(numbers).chain() 53 .reverse() 54 .concat([5, 5, 5]) 55 .unshift(17) 56 .pop() 57 .map(function(n){ return n * 2; }) 58 .value(); 59 assert.deepEqual(numbers, [34, 10, 8, 6, 4, 2, 10, 10], 'can chain together array functions.'); 60 }); 61 62 QUnit.test('splice', function(assert) { 63 var instance = _([1, 2, 3, 4, 5]).chain(); 64 assert.deepEqual(instance.splice(1, 3).value(), [1, 5]); 65 assert.deepEqual(instance.splice(1, 0).value(), [1, 5]); 66 assert.deepEqual(instance.splice(1, 1).value(), [1]); 67 assert.deepEqual(instance.splice(0, 1).value(), [], '#397 Can create empty array'); 68 }); 69 70 QUnit.test('shift', function(assert) { 71 var instance = _([1, 2, 3]).chain(); 72 assert.deepEqual(instance.shift().value(), [2, 3]); 73 assert.deepEqual(instance.shift().value(), [3]); 74 assert.deepEqual(instance.shift().value(), [], '#397 Can create empty array'); 75 }); 76 77 QUnit.test('pop', function(assert) { 78 var instance = _([1, 2, 3]).chain(); 79 assert.deepEqual(instance.pop().value(), [1, 2]); 80 assert.deepEqual(instance.pop().value(), [1]); 81 assert.deepEqual(instance.pop().value(), [], '#397 Can create empty array'); 82 }); 83 84 QUnit.test('chaining works in small stages', function(assert) { 85 var o = _([1, 2, 3, 4]).chain(); 86 assert.deepEqual(o.filter(function(i) { return i < 3; }).value(), [1, 2]); 87 assert.deepEqual(o.filter(function(i) { return i > 2; }).value(), [3, 4]); 88 }); 89 90 QUnit.test('#1562: Engine proxies for chained functions', function(assert) { 91 var wrapped = _(512); 92 assert.strictEqual(wrapped.toJSON(), 512); 93 assert.strictEqual(wrapped.valueOf(), 512); 94 assert.strictEqual(+wrapped, 512); 95 assert.strictEqual(wrapped.toString(), '512'); 96 assert.strictEqual('' + wrapped, '512'); 97 }); 98 99}()); 100