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Better Underscore isType checking, in the presence of Internet Explorer host objects, which are a bit touchy.

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This commit is contained in:
Jeremy Ashkenas
2010-12-01 10:25:55 -05:00
parent 00237103fc
commit 6b8bb0cacd
3 changed files with 24 additions and 11 deletions
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16
underscore.js
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@@ -588,7 +588,13 @@
// Is a given value a number?
_.isNumber = function(obj) {
return (obj === +obj) || (toString.call(obj) === '[object Number]');
return !!(obj === 0 || (obj && obj.toExponential && obj.toFixed));
};
// 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) {
return toString.call(obj) === '[object Number]' && isNaN(obj);
};
// Is a given value a boolean?
@@ -606,12 +612,6 @@
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) {
return _.isNumber(obj) && isNaN(obj);
};
// Is a given value equal to null?
_.isNull = function(obj) {
return obj === null;
@@ -619,7 +619,7 @@
// Is a given variable undefined?
_.isUndefined = function(obj) {
return typeof obj == 'undefined';
return obj === void 0;
};
// Utility Functions