Benchmark Run Result for: _.isEmpty vs for-in

Test name	Executions per second
_.isEmpty	207913.8 Ops/sec
for-in	240765.2 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

window.obj = {};

for (var i = 0, len = 100; i < len; i++) {
  obj['key' + i] = 'value' + i;
}

Tests:

_.isEmpty
function isEmpty(obj) { return _.isEmpty(obj); } isEmpty(window.obj);
for-in
function isEmpty(obj) { for(var i in obj) return false; return true; } isEmpty(window.obj);