Run results for: Underscore vs native

Run details:

User agent: Mozilla/5.0 (Android 14; Mobile; rv:133.0) Gecko/133.0 Firefox/133.0

Browser: Firefox Mobile 133

Operating system: Android

Device Platform: Mobile

Date tested: 5 months ago

Test name	Executions per second
Underscore	1242.2 Ops/sec
Native	1534.1 Ops/sec

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.0/underscore.js"></script>

Script Preparation code:

  var data = _.range(10000).map(function(i) {
    return {
      counter: i
    }
  });
  
  function isOdd(num) {
    return num % 2 === 1;
  }
  
  function square(num) {
    return num * num;
  }
  
  function lessThanThreeDigits(num) {
    return num.toString().length < 3;
  }

Tests:

Underscore
var result = _.chain(data) .map(item => item.counter) .filter(isOdd) .map(square) .filter(lessThanThreeDigits) .value();
Native
var result = data.map(item => item.counter) .filter(isOdd) .map(square) .filter(lessThanThreeDigits)

Run results for: Underscore vs native

Underscore

Native