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maintain a single reference to the Object.prototype

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This commit is contained in:
Jeremy Ashkenas
2009-12-06 13:20:56 -05:00
parent 689cd97e03
commit 86c2ad2b1f
1 changed files with 8 additions and 5 deletions
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13
underscore.js
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@@ -30,6 +30,9 @@
// Export the Underscore object for CommonJS.
if (typeof exports !== 'undefined') exports._ = _;
// Maintain a reference to the Object prototype for quick access.
var oproto = Object.prototype;
// Current version.
_.VERSION = '0.4.6';
@@ -392,7 +395,7 @@
_.keys = function(obj) {
if(_.isArray(obj)) return _.range(0, obj.length);
var keys = [];
for (var key in obj) if (Object.prototype.hasOwnProperty.call(obj, key)) keys.push(key);
for (var key in obj) if (oproto.hasOwnProperty.call(obj, key)) keys.push(key);
return keys;
};
@@ -453,22 +456,22 @@
// Is a given value a real Array?
_.isArray = function(obj) {
return Object.prototype.toString.call(obj) == '[object Array]';
return oproto.toString.call(obj) == '[object Array]';
};
// Is a given value a Function?
_.isFunction = function(obj) {
return Object.prototype.toString.call(obj) == '[object Function]';
return oproto.toString.call(obj) == '[object Function]';
};
// Is a given value a String?
_.isString = function(obj) {
return Object.prototype.toString.call(obj) == '[object String]';
return oproto.toString.call(obj) == '[object String]';
};
// Is a given value a Number?
_.isNumber = function(obj) {
return Object.prototype.toString.call(obj) == '[object Number]';
return oproto.toString.call(obj) == '[object Number]';
};
// Is a given variable undefined?