Run results for: non-unique-elements

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36

Browser: Chrome 53

Operating system: Windows

Device Platform: Other

Date tested: 8 years ago

Test name	Executions per second
Count	88.2 Ops/sec
IndexOf	133.0 Ops/sec

Tests:

Count
for(var i=0;i<10000;i++) { var data = [1, 2, 3, 1, 3]; var cnt = {}; data.forEach(d => cnt[d] ? cnt[d]++ : cnt[d]=1); data.filter(d => cnt[d] > 1); }
IndexOf
for(var i=0;i<10000;i++) { var data = [1, 2, 3, 1, 3]; data.filter(d => data.indexOf(d) != data.lastIndexOf(d)); }