How do I test for an empty JavaScript object?
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Using Object.keys(obj).length (as suggested above for ECMA 5+) is 10 times slower for empty objects! keep with the old school (for…in) option.
Tested under Node, Chrome, Firefox and IE 9, it becomes evident that for most use cases:
Bottom line performance wise, use:
or
See detailed testing results and test code at Is object empty?
How do I test for an empty JavaScript object?
Note, though, that this creates an unnecessary array (the return value of
keys
).Pre-ECMA 5:
jQuery:
lodash:
Underscore:
Hoek
ExtJS
AngularJS (version 1)
Ramda