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make a local variable that points to Array.prototype since the former is not min'd down.

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Won't effect gzip size, but reduces min size.  Saves about:

15 bytes per instance * 13 instances ≅ 200 bytes
This commit is contained in:
Mike Frawley
2010-02-22 15:57:23 -06:00
parent bb250e7205
commit 31f0f8c54c
1 changed files with 17 additions and 16 deletions
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33
underscore.js
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@@ -30,28 +30,29 @@
// Export the Underscore object for CommonJS. // Export the Underscore object for CommonJS.
if (typeof exports !== 'undefined') exports._ = _; if (typeof exports !== 'undefined') exports._ = _;
// Save bytes in the minified (but not gzipped) version:
var ArrayPrototype = Array.prototype;
// Create quick reference variables for speed access to core prototypes. // Create quick reference variables for speed access to core prototypes.
var slice = Array.prototype.slice, var slice = ArrayPrototype.slice,
unshift = Array.prototype.unshift, unshift = ArrayPrototype.unshift,
toString = Object.prototype.toString, toString = Object.prototype.toString,
hasOwnProperty = Object.prototype.hasOwnProperty, hasOwnProperty = Object.prototype.hasOwnProperty,
propertyIsEnumerable = Object.prototype.propertyIsEnumerable; propertyIsEnumerable = Object.prototype.propertyIsEnumerable;
// All native implementations we hope to use are declared here, // All native implementations we hope to use are declared here.
// mostly Array.prototype methods.
//
// 'native' is on the long list of reserved words. // 'native' is on the long list of reserved words.
// Ok to use as a property name, though jsLint doesn't agree. // Ok to use as a property name, though jsLint doesn't agree.
var Native = _['native'] = { var Native = _['native'] = {
forEach: Array.prototype.forEach, forEach: ArrayPrototype.forEach,
map: Array.prototype.map, map: ArrayPrototype.map,
reduce: Array.prototype.reduce, reduce: ArrayPrototype.reduce,
reduceRight: Array.prototype.reduceRight, reduceRight: ArrayPrototype.reduceRight,
filter: Array.prototype.filter, filter: ArrayPrototype.filter,
every: Array.prototype.every, every: ArrayPrototype.every,
some: Array.prototype.some, some: ArrayPrototype.some,
indexOf: Array.prototype.indexOf, indexOf: ArrayPrototype.indexOf,
lastIndexOf: Array.prototype.lastIndexOf, lastIndexOf: ArrayPrototype.lastIndexOf,
isArray: Array.isArray, isArray: Array.isArray,
keys: Object.keys keys: Object.keys
}; };
@@ -688,7 +689,7 @@
// Add all mutator Array functions to the wrapper. // Add all mutator Array functions to the wrapper.
each(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(name) { each(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(name) {
var method = Array.prototype[name]; var method = ArrayPrototype[name];
wrapper.prototype[name] = function() { wrapper.prototype[name] = function() {
method.apply(this._wrapped, arguments); method.apply(this._wrapped, arguments);
return result(this._wrapped, this._chain); return result(this._wrapped, this._chain);
@@ -697,7 +698,7 @@
// Add all accessor Array functions to the wrapper. // Add all accessor Array functions to the wrapper.
each(['concat', 'join', 'slice'], function(name) { each(['concat', 'join', 'slice'], function(name) {
var method = Array.prototype[name]; var method = ArrayPrototype[name];
wrapper.prototype[name] = function() { wrapper.prototype[name] = function() {
return result(method.apply(this._wrapped, arguments), this._chain); return result(method.apply(this._wrapped, arguments), this._chain);
}; };