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cache is string and toString to improve performance

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Noah Sloan
2009-12-08 14:11:28 -06:00
parent 0ed4212ec6
commit 8c7fcb7781
1 changed files with 2 additions and 1 deletions
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3
underscore.js
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@@ -478,8 +478,9 @@
// Define the isArray, isDate, isFunction, isNumber, isRegExp, and // Define the isArray, isDate, isFunction, isNumber, isRegExp, and
// isString functions based on their toString identifiers. // isString functions based on their toString identifiers.
_.each(['Array', 'Date', 'Function', 'Number', 'RegExp', 'String'], function(type) { _.each(['Array', 'Date', 'Function', 'Number', 'RegExp', 'String'], function(type) {
var toString = Object.prototype.toString, typeString = '[object ' + type + ']';
_['is' + type] = function(obj) { _['is' + type] = function(obj) {
return Object.prototype.toString.call(obj) == '[object ' + type + ']'; return toString.call(obj) == typeString;
}; };
}); });