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(function() {
var _ = typeof require == 'function' ? require('..') : window._;
QUnit.module('Chaining');
QUnit.test('map/flatten/reduce', function(assert) {
var lyrics = [
'I\'m a lumberjack and I\'m okay',
'I sleep all night and I work all day',
'He\'s a lumberjack and he\'s okay',
'He sleeps all night and he works all day'
];
var counts = _(lyrics).chain()
.map(function(line) { return line.split(''); })
.flatten()
.reduce(function(hash, l) {
hash[l] = hash[l] || 0;
hash[l]++;
return hash;
}, {})
.value();
assert.equal(counts.a, 16, 'counted all the letters in the song');
assert.equal(counts.e, 10, 'counted all the letters in the song');
});
QUnit.test('select/reject/sortBy', function(assert) {
var numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
numbers = _(numbers).chain().select(function(n) {
return n % 2 === 0;
}).reject(function(n) {
return n % 4 === 0;
}).sortBy(function(n) {
return -n;
}).value();
assert.deepEqual(numbers, [10, 6, 2], 'filtered and reversed the numbers');
});
QUnit.test('select/reject/sortBy in functional style', function(assert) {
var numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
numbers = _.chain(numbers).select(function(n) {
return n % 2 === 0;
}).reject(function(n) {
return n % 4 === 0;
}).sortBy(function(n) {
return -n;
}).value();
assert.deepEqual(numbers, [10, 6, 2], 'filtered and reversed the numbers');
});
QUnit.test('reverse/concat/unshift/pop/map', function(assert) {
var numbers = [1, 2, 3, 4, 5];
numbers = _(numbers).chain()
.reverse()
.concat([5, 5, 5])
.unshift(17)
.pop()
.map(function(n){ return n * 2; })
.value();
assert.deepEqual(numbers, [34, 10, 8, 6, 4, 2, 10, 10], 'can chain together array functions.');
});
QUnit.test('splice', function(assert) {
var instance = _([1, 2, 3, 4, 5]).chain();
assert.deepEqual(instance.splice(1, 3).value(), [1, 5]);
assert.deepEqual(instance.splice(1, 0).value(), [1, 5]);
assert.deepEqual(instance.splice(1, 1).value(), [1]);
assert.deepEqual(instance.splice(0, 1).value(), [], '#397 Can create empty array');
});
QUnit.test('shift', function(assert) {
var instance = _([1, 2, 3]).chain();
assert.deepEqual(instance.shift().value(), [2, 3]);
assert.deepEqual(instance.shift().value(), [3]);
assert.deepEqual(instance.shift().value(), [], '#397 Can create empty array');
});
QUnit.test('pop', function(assert) {
var instance = _([1, 2, 3]).chain();
assert.deepEqual(instance.pop().value(), [1, 2]);
assert.deepEqual(instance.pop().value(), [1]);
assert.deepEqual(instance.pop().value(), [], '#397 Can create empty array');
});
QUnit.test('chaining works in small stages', function(assert) {
var o = _([1, 2, 3, 4]).chain();
assert.deepEqual(o.filter(function(i) { return i < 3; }).value(), [1, 2]);
assert.deepEqual(o.filter(function(i) { return i > 2; }).value(), [3, 4]);
});
QUnit.test('#1562: Engine proxies for chained functions', function(assert) {
var wrapped = _(512);
assert.strictEqual(wrapped.toJSON(), 512);
assert.strictEqual(wrapped.valueOf(), 512);
assert.strictEqual(+wrapped, 512);
assert.strictEqual(wrapped.toString(), '512');
assert.strictEqual('' + wrapped, '512');
});
}());
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