Run details:
Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.88 Safari/537.36
Chrome 100
Windows
Desktop
2 years ago
Test name Executions per second
Not empty lodash.head() 4591312.5 Ops/sec
Not empty [0] 13239941.0 Ops/sec
Empty lodash.head() 4531462.5 Ops/sec
Empty [0] 13455638.0 Ops/sec
[0] with check 4643555.5 Ops/sec
[0] with null check 3634263.8 Ops/sec
HTML Preparation code:
x
 
1
2
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
Script Preparation code:
 
var a = [1,2,3];
var e = [];
Tests:
  • Not empty lodash.head()

     
    _.head(a)
  • Not empty [0]

     
    a[0]
  • Empty lodash.head()

     
    _.head(e)
  • Empty [0]

     
    e[0]
  • [0] with check

     
    e.length ? e[0] : undefined
  • [0] with null check

     
    e && e.length ? e[0] : undefined