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shrunk down all of the 'is' functions into a single generation, added isRegExp, added a regexp equality test to isEqual, after grayrest's patch

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Jeremy Ashkenas
2009-12-06 22:48:40 -05:00
parent 4bd535e7f1
commit 66dc6c2ac1
3 changed files with 20 additions and 33 deletions
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50
underscore.js
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@@ -30,9 +30,6 @@
// Export the Underscore object for CommonJS.
if (typeof exports !== 'undefined') exports._ = _;
// Maintain a reference to the Object prototype for quick access.
var objPro = Object.prototype;
// Current version.
_.VERSION = '0.4.7';
@@ -395,7 +392,7 @@
_.keys = function(obj) {
if(_.isArray(obj)) return _.range(0, obj.length);
var keys = [];
for (var key in obj) if (objPro.hasOwnProperty.call(obj, key)) keys.push(key);
for (var key in obj) if (Object.prototype.hasOwnProperty.call(obj, key)) keys.push(key);
return keys;
};
@@ -425,16 +422,22 @@
if (atype != btype) return false;
// Basic equality test (watch out for coercions).
if (a == b) return true;
// Check dates' integer values.
if (_.isDate(a) && _.isDate(b)) return a.getTime() === b.getTime();
// One of them implements an isEqual()?
if (a.isEqual) return a.isEqual(b);
// Check dates' integer values.
if (_.isDate(a) && _.isDate(b)) return a.getTime() === b.getTime();
// Both are NaN?
if (_.isNaN(a) && _.isNaN(b)) return true;
// Compare regular expressions.
if (_.isRegExp(a) && _.isRegExp(b))
return a.source === b.source &&
a.global === b.global &&
a.ignoreCase === b.ignoreCase &&
a.multiline === b.multiline;
// If a is not an object by this point, we can't handle it.
if (atype !== 'object') return false;
// Check for different array lengths before comparing contents.
if (!_.isUndefined(a.length) && a.length !== b.length) return false;
if (a.length && (a.length !== b.length)) return false;
// Nothing else worked, deep compare the contents.
var aKeys = _.keys(a), bKeys = _.keys(b);
// Different object sizes?
@@ -454,31 +457,6 @@
return !!(obj && obj.nodeType == 1);
};
// Is a given value a real Array?
_.isArray = function(obj) {
return objPro.toString.call(obj) == '[object Array]';
};
// Is a given value a Function?
_.isFunction = function(obj) {
return objPro.toString.call(obj) == '[object Function]';
};
// Is a given value a String?
_.isString = function(obj) {
return objPro.toString.call(obj) == '[object String]';
};
// Is a given value a Number?
_.isNumber = function(obj) {
return objPro.toString.call(obj) == '[object Number]';
};
// Is a given value a Date?
_.isDate = function(obj) {
return objPro.toString.call(obj) == '[object Date]';
};
// Is the given value NaN -- this one is interesting. NaN != NaN, and
// isNaN(undefined) == true, so we make sure it's a number first.
_.isNaN = function(obj) {
@@ -495,6 +473,14 @@
return typeof obj == 'undefined';
};
// Define the isArray, isDate, isFunction, isNumber, isRegExp, and
// isString functions based on their toString identifiers.
_.each(['Array', 'Date', 'Function', 'Number', 'RegExp', 'String'], function(type) {
_['is' + type] = function(obj) {
return Object.prototype.toString.call(obj) == '[object ' + type + ']';
};
});
/* -------------------------- Utility Functions: -------------------------- */
// Run Underscore.js in noConflict mode, returning the '_' variable to its