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use var native_reduceRight etc. variables instead of Native = { reduceRight: ... }

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This way we only get the native versions of functions we use.
Will make testing non-native versions as we can't just swap do `_.Native = {}`,
but this wouldn't have worked for `isArray` and `keys` anyways, as these are
looked up on initialization, so I think the solution is to have an init()
method on underscore where we will re-initialize functions and try and use
native versions then
This commit is contained in:
Mike Frawley
2010-02-23 17:13:18 -06:00
parent b5449ca89a
commit 164e19c121
1 changed files with 28 additions and 31 deletions
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59
underscore.js
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@@ -32,31 +32,28 @@
if (typeof exports !== 'undefined') exports._ = _;
// Save bytes in the minified (but not gzipped) version:
var ArrayPrototype = Array.prototype;
var Array_Prototype = Array.prototype;
// Create quick reference variables for speed access to core prototypes.
var slice = ArrayPrototype.slice,
unshift = ArrayPrototype.unshift,
var slice = Array_Prototype.slice,
unshift = Array_Prototype.unshift,
toString = Object.prototype.toString,
hasOwnProperty = Object.prototype.hasOwnProperty,
propertyIsEnumerable = Object.prototype.propertyIsEnumerable;
// All native implementations we hope to use are declared here.
// 'native' is on the long list of reserved words.
// Ok to use as a property name, though jsLint doesn't agree.
var Native = _['native'] = {
forEach: ArrayPrototype.forEach,
map: ArrayPrototype.map,
reduce: ArrayPrototype.reduce,
reduceRight: ArrayPrototype.reduceRight,
filter: ArrayPrototype.filter,
every: ArrayPrototype.every,
some: ArrayPrototype.some,
indexOf: ArrayPrototype.indexOf,
lastIndexOf: ArrayPrototype.lastIndexOf,
isArray: Array.isArray,
keys: Object.keys
};
var
native_forEach = Array_Prototype.forEach,
native_map = Array_Prototype.map,
native_reduce = Array_Prototype.reduce,
native_reduceRight = Array_Prototype.reduceRight,
native_filter = Array_Prototype.filter,
native_every = Array_Prototype.every,
native_some = Array_Prototype.some,
native_indexOf = Array_Prototype.indexOf,
native_lastIndexOf = Array_Prototype.lastIndexOf,
native_isArray = Array['isArray'],
native_keys = Object['keys'];
// Current version.
_.VERSION = '0.5.8';
@@ -70,7 +67,7 @@
_.forEach = function(obj, iterator, context) {
var index = 0;
try {
if (obj.forEach === Native.forEach) {
if (obj.forEach === native_forEach) {
obj.forEach(iterator, context);
} else if (_.isNumber(obj.length)) {
for (var i=0, l=obj.length; i<l; i++) iterator.call(context, obj[i], i, obj);
@@ -87,7 +84,7 @@
// Return the results of applying the iterator to each element.
// Delegates to JavaScript 1.6's native map if available.
_.map = function(obj, iterator, context) {
if (obj.map === Native.map) return obj.map(iterator, context);
if (obj.map === native_map) return obj.map(iterator, context);
var results = [];
each(obj, function(value, index, list) {
results.push(iterator.call(context, value, index, list));
@@ -99,7 +96,7 @@
// inject, or foldl.
// Delegates to JavaScript 1.8's native reduce if available.
_.reduce = function(obj, memo, iterator, context) {
if (obj.reduce === Native.reduce) return obj.reduce(_.bind(iterator, context), memo);
if (obj.reduce === native_reduce) return obj.reduce(_.bind(iterator, context), memo);
each(obj, function(value, index, list) {
memo = iterator.call(context, memo, value, index, list);
});
@@ -109,7 +106,7 @@
// The right-associative version of reduce, also known as foldr. Uses
// Delegates to JavaScript 1.8's native reduceRight if available.
_.reduceRight = function(obj, memo, iterator, context) {
if (obj.reduceRight === Native.reduceRight) return obj.reduceRight(_.bind(iterator, context), memo);
if (obj.reduceRight === native_reduceRight) return obj.reduceRight(_.bind(iterator, context), memo);
var reversed = _.clone(_.toArray(obj)).reverse();
return reduce(reversed, memo, iterator, context);
};
@@ -129,7 +126,7 @@
// Return all the elements that pass a truth test.
// Delegates to JavaScript 1.6's native filter if available.
_.filter = function(obj, iterator, context) {
if (obj.filter === Native.filter) return obj.filter(iterator, context);
if (obj.filter === native_filter) return obj.filter(iterator, context);
var results = [];
each(obj, function(value, index, list) {
iterator.call(context, value, index, list) && results.push(value);
@@ -150,7 +147,7 @@
// Delegates to JavaScript 1.6's native every if available.
_.every = function(obj, iterator, context) {
iterator = iterator || _.identity;
if (obj.every === Native.every) return obj.every(iterator, context);
if (obj.every === native_every) return obj.every(iterator, context);
var result = true;
each(obj, function(value, index, list) {
if (!(result = result && iterator.call(context, value, index, list))) _.breakLoop();
@@ -162,7 +159,7 @@
// Delegates to JavaScript 1.6's native some if available.
_.some = function(obj, iterator, context) {
iterator = iterator || _.identity;
if (obj.some === Native.some) return obj.some(iterator, context);
if (obj.some === native_some) return obj.some(iterator, context);
var result = false;
each(obj, function(value, index, list) {
if (result = iterator.call(context, value, index, list)) _.breakLoop();
@@ -347,7 +344,7 @@
// item in an array, or -1 if the item is not included in the array.
// Delegates to JavaScript 1.8's native indexOf if available.
_.indexOf = function(array, item) {
if (array.indexOf === Native.indexOf) return array.indexOf(item);
if (array.indexOf === native_indexOf) return array.indexOf(item);
for (var i=0, l=array.length; i<l; i++) if (array[i] === item) return i;
return -1;
};
@@ -355,7 +352,7 @@
// Delegates to JavaScript 1.6's native lastIndexOf if available.
_.lastIndexOf = function(array, item) {
if (array.lastIndexOf === Native.lastIndexOf) return array.lastIndexOf(item);
if (array.lastIndexOf === native_lastIndexOf) return array.lastIndexOf(item);
var i = array.length;
while (i--) if (array[i] === item) return i;
return -1;
@@ -437,7 +434,7 @@
// Retrieve the names of an object's properties.
// Delegates to ECMA5's native Object.keys
_.keys = Native.keys || function(obj) {
_.keys = native_keys || function(obj) {
if (_.isArray(obj)) return _.range(0, obj.length);
var keys = [];
for (var key in obj) if (hasOwnProperty.call(obj, key)) keys.push(key);
@@ -548,7 +545,7 @@
// Is a given value an array?
// Delegates to ECMA5's native Array.isArray
_.isArray = Native.isArray || function(obj) {
_.isArray = native_isArray || function(obj) {
return !!(obj && obj.concat && obj.unshift);
};
@@ -690,7 +687,7 @@
// Add all mutator Array functions to the wrapper.
each(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(name) {
var method = ArrayPrototype[name];
var method = Array_Prototype[name];
wrapper.prototype[name] = function() {
method.apply(this._wrapped, arguments);
return result(this._wrapped, this._chain);
@@ -699,7 +696,7 @@
// Add all accessor Array functions to the wrapper.
each(['concat', 'join', 'slice'], function(name) {
var method = ArrayPrototype[name];
var method = Array_Prototype[name];
wrapper.prototype[name] = function() {
return result(method.apply(this._wrapped, arguments), this._chain);
};