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Tweak _.find to avoid using _.identity and add benchmark.

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Former-commit-id: a881f90d00828ed6af5b2b0bc80c9ae6e2cb2da8
This commit is contained in:
John-David Dalton
2012-05-26 00:07:50 -04:00
parent 06ffa93bd0
commit 2008bf90af
2 changed files with 23 additions and 4 deletions
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11
lodash.js
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@@ -302,6 +302,11 @@
'inLoop': 'callback(collection[index], index, collection) && result.push(collection[index])' 'inLoop': 'callback(collection[index], index, collection) && result.push(collection[index])'
}; };
/** Reusable iterator options for `find` and `forEach` */
var forEachIteratorOptions = {
'top': 'if (thisArg) callback = bind(callback, thisArg)'
};
/** Reusable iterator options for `map`, `pluck`, and `values` */ /** Reusable iterator options for `map`, `pluck`, and `values` */
var mapIteratorOptions = { var mapIteratorOptions = {
'init': '', 'init': '',
@@ -584,7 +589,7 @@
* var even = _.find([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; }); * var even = _.find([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
* // => 2 * // => 2
*/ */
var find = createIterator(baseIteratorOptions, { var find = createIterator(baseIteratorOptions, forEachIteratorOptions, {
'init': '', 'init': '',
'inLoop': 'if (callback(collection[index], index, collection)) return collection[index]' 'inLoop': 'if (callback(collection[index], index, collection)) return collection[index]'
}); });
@@ -611,9 +616,7 @@
* _([1, 2, 3]).forEach(function(num) { alert(num); }).join(','); * _([1, 2, 3]).forEach(function(num) { alert(num); }).join(',');
* // => alerts each number in turn and returns '1,2,3' * // => alerts each number in turn and returns '1,2,3'
*/ */
var forEach = createIterator(baseIteratorOptions, { var forEach = createIterator(baseIteratorOptions, forEachIteratorOptions);
'top': 'if (thisArg) callback = bind(callback, thisArg)'
});
/** /**
* Produces a new array of values by mapping each value in the `collection` * Produces a new array of values by mapping each value in the `collection`

16
perf/perf.js
View File

@@ -205,6 +205,22 @@
/*--------------------------------------------------------------------------*/ /*--------------------------------------------------------------------------*/
suites.push(
Benchmark.Suite('find')
.add('Lo-Dash', function() {
lodash.find(numbers, function(num) {
return num === 19;
});
})
.add('Underscore', function() {
_.find(numbers, function(num) {
return num === 19;
});
})
);
/*--------------------------------------------------------------------------*/
suites.push( suites.push(
Benchmark.Suite('flatten deep') Benchmark.Suite('flatten deep')
.add('Lo-Dash', function() { .add('Lo-Dash', function() {