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Merge branch 'betterIsX' of https://github.com/michaelficarra/underscore

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This commit is contained in:
Jeremy Ashkenas
2011-10-24 11:16:04 -04:00
parent 38b1fe0dd3 42e04ecc7a
commit 58c88ccc59
2 changed files with 21 additions and 12 deletions
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28
underscore.js
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@@ -733,7 +733,8 @@
return eq(a, b, []);
};
// Is a given array or object empty?
// Is a given array, string, or object empty?
// An "empty" object has no enumerable own-properties.
_.isEmpty = function(obj) {
if (_.isArray(obj) || _.isString(obj)) return obj.length === 0;
for (var key in obj) if (hasOwnProperty.call(obj, key)) return false;
@@ -748,7 +749,7 @@
// Is a given value an array?
// Delegates to ECMA5's native Array.isArray
_.isArray = nativeIsArray || function(obj) {
return toString.call(obj) === '[object Array]';
return toString.call(obj) == '[object Array]';
};
// Is a given variable an object?
@@ -757,23 +758,30 @@
};
// Is a given variable an arguments object?
_.isArguments = function(obj) {
return !!(obj && hasOwnProperty.call(obj, 'callee'));
};
_.isArguments = toString.call(arguments) == '[object Arguments]'
? function(obj) {
return toString.call(obj) == '[object Arguments]';
}
: function(obj) {
return obj
? hasOwnProperty.call(obj, 'callee')
&& hasOwnProperty.call(obj, 'length')
: false;
};
// Is a given value a function?
_.isFunction = function(obj) {
return !!(obj && obj.constructor && obj.call && obj.apply);
return toString.call(obj) == '[object Function]';
};
// Is a given value a string?
_.isString = function(obj) {
return !!(obj === '' || (obj && obj.charCodeAt && obj.substr));
return toString.call(obj) == '[object String]';
};
// Is a given value a number?
_.isNumber = function(obj) {
return !!(obj === 0 || (obj && obj.toExponential && obj.toFixed));
return toString.call(obj) == '[object Number]';
};
// Is the given value `NaN`?
@@ -789,12 +797,12 @@
// Is a given value a date?
_.isDate = function(obj) {
return !!(obj && obj.getTimezoneOffset && obj.setUTCFullYear);
return toString.call(obj) == '[object Date]';
};
// Is the given value a regular expression?
_.isRegExp = function(obj) {
return !!(obj && obj.test && obj.exec && (obj.ignoreCase || obj.ignoreCase === false));
return toString.call(obj) == '[object RegExp]';
};
// Is a given value equal to null?