Benchmark: uniqBy vs filter+set

HTML Preparation code:

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

Script Preparation code:

var smalldata = [1,2,3,4,5,'ok','abc','def',null,undefined,1,2,3,'ok'];
var bigdata = [1,2,3,4,5,'ok','abc','def',null,undefined,1,2,3,'ok',1,2,3,4,5,'ok','abc','def',null,undefined,1,2,3,'ok',1,2,3,4,5,'ok','abc','def',null,undefined,1,2,3,'ok',1,2,3,4,5,'ok','abc','def',null,undefined,1,2,3,'ok',1,2,3,4,5,'ok','abc','def',null,undefined,1,2,3,'ok',1,2,3,4,5,'ok','abc','def',null,undefined,1,2,3,'ok',1,2,3,4,5,'ok','abc','def',null,undefined,1,2,3,'ok',1,2,3,4,5,'ok','abc','def',null,undefined,1,2,3,'ok',1,2,3,4,5,'ok','abc','def',null,undefined,1,2,3,'ok'];

var uniqBy = (arr, fn) => {
  var dups = new Set();
  return arr.filter((v) => {
    const k = fn(v);
    if (dups.has(k)) {
      return false;
    }
    dups.add(k);
    return true;
  });
};

Tests:

lodash/uniqBy
_.uniqBy(smalldata, (v) => v); _.uniqBy(bigdata, (v) => v);
filter+set
uniqBy(smalldata, (v) => v); uniqBy(bigdata, (v) => v);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash/uniqBy
filter+set

Fastest: N/A

Slowest: N/A

ⓘ Get performance results from real users on your website with Request Metrics.

Website Performance Monitoring by Request Metrics

Latest run results:

Run details: (Test run date: 4 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser/OS: Chrome 119 on Windows

View result in a separate tab

Test name	Executions per second
lodash/uniqBy	294530.4 Ops/sec
filter+set	360457.5 Ops/sec

uniqBy vs filter+set (version: 0)

Comparing performance of: lodash/uniqBy vs filter+set

Created: 3 years ago by: Registered User

Jump to the latest result

lodash/uniqBy

filter+set

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A