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short circuit isEmpty for null/undefined

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Brad Dunbar
2012-01-30 10:15:04 -05:00
parent bdb3cb21f9
commit 5c6abc4453
1 changed files with 1 additions and 0 deletions
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underscore.js
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@@ -761,6 +761,7 @@
// Is a given array, string, or object empty? // Is a given array, string, or object empty?
// An "empty" object has no enumerable own-properties. // An "empty" object has no enumerable own-properties.
_.isEmpty = function(obj) { _.isEmpty = function(obj) {
if (obj == null) return true;
if (_.isArray(obj) || _.isString(obj)) return obj.length === 0; if (_.isArray(obj) || _.isString(obj)) return obj.length === 0;
for (var key in obj) if (_.has(obj, key)) return false; for (var key in obj) if (_.has(obj, key)) return false;
return true; return true;