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replacing all isType tests that relied on string comparisons with versions that check for existence of known methods and properties. Less safe, but more than an order of magnitude faster.

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This commit is contained in:
Jeremy Ashkenas
2010-01-01 19:05:34 -05:00
parent d49196f2e7
commit 4be6a194cd
3 changed files with 81 additions and 17 deletions
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25
test/temp.js Normal file
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@@ -0,0 +1,25 @@
(function() {
var func = function(){};
var date = new Date();
var str = "a string";
var numbers = [];
for (var i=0; i<1000; i++) numbers.push(i);
var objects = _.map(numbers, function(n){ return {num : n}; });
var randomized = _.sortBy(numbers, function(){ return Math.random(); });
JSLitmus.test('_.each()', function() {
var timesTwo = [];
_.each(numbers, function(num){ timesTwo.push(num * 2); });
return timesTwo;
});
JSLitmus.test('_.isString', function() {
return _.isString(str);
});
JSLitmus.test('_.isStringNew', function() {
return _.isStringNew(str);
});
})();

19
test/temp_tests.html Normal file
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@@ -0,0 +1,19 @@
<!DOCTYPE HTML>
<html>
<head>
<title>Underscore Temporary Tests</title>
<link rel="stylesheet" href="vendor/qunit.css" type="text/css" media="screen" />
<script type="text/javascript" src="vendor/jquery.js"></script>
<script type="text/javascript" src="vendor/jslitmus.js"></script>
<script type="text/javascript" src="../underscore.js"></script>
<script type="text/javascript" src="temp.js"></script>
</head>
<body>
<h1 class="qunit-header">Underscore Temporary Tests</h1>
<h2 class="qunit-userAgent">
A page for temporary speed tests, used for developing faster implementations
of existing Underscore methods.
</h2>
<br />
</body>
</html>

54
underscore.js
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@@ -428,6 +428,13 @@
return _.extend({}, obj);
};
// Invokes interceptor with the obj, and then returns obj.
// The primary purpose of this method is to "tap into" a method chain, in order to perform operations on intermediate results within the chain.
_.tap = function(obj, interceptor) {
interceptor(obj);
return obj;
};
// Perform a deep comparison to check if two objects are equal.
_.isEqual = function(a, b) {
// Check object identity.
@@ -474,11 +481,41 @@
return !!(obj && obj.nodeType == 1);
};
// Is a given value an array?
_.isArray = function(obj) {
return obj && obj.concat && obj.unshift;
};
// Is a given variable an arguments object?
_.isArguments = function(obj) {
return obj && _.isNumber(obj.length) && !_.isArray(obj) && !propertyIsEnumerable.call(obj, 'length');
};
// Is a given value a function?
_.isFunction = function(obj) {
return obj && obj.constructor && obj.call && obj.apply;
};
// Is a given value a string?
_.isString = function(obj) {
return obj === '' || (obj && obj.charCodeAt && obj.substr);
};
// Is a given value a number?
_.isNumber = function(obj) {
return toString.call(obj) === '[object Number]';
};
// Is a given value a date?
_.isDate = function(obj) {
return obj && obj.getTimezoneOffset && obj.setUTCFullYear;
};
// Is the given value a regular expression?
_.isRegExp = function(obj) {
return obj && obj.test && obj.exec && (obj.ignoreCase || obj.ignoreCase === false);
};
// 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) {
@@ -495,23 +532,6 @@
return typeof obj == 'undefined';
};
// Invokes interceptor with the obj, and then returns obj.
// The primary purpose of this method is to "tap into" a method chain, in order to perform operations on intermediate results within the chain.
_.tap = function(obj, interceptor) {
interceptor(obj);
return obj;
}
// Define the isArray, isDate, isFunction, isNumber, isRegExp, and isString
// functions based on their toString identifiers.
var types = ['Array', 'Date', 'Function', 'Number', 'RegExp', 'String'];
for (var i=0, l=types.length; i<l; i++) {
(function() {
var identifier = '[object ' + types[i] + ']';
_['is' + types[i]] = function(obj) { return toString.call(obj) == identifier; };
})();
}
/* -------------------------- Utility Functions: -------------------------- */
// Run Underscore.js in noConflict mode, returning the '_' variable to its