MeasureThat.net

Run results for: create temp object vs Object.fromEntries

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.77 Safari/537.36
Chrome 91
Mac OS X 10.15.7
Desktop
3 years ago
Test name Executions per second
Object.fromEntries 936.6 Ops/sec
creating temporary objects 1597.7 Ops/sec
Script Preparation code:
AخA
 
var array = Array.from(Array(10000).keys()).map(i => {
    var length = Math.round(Math.random()*100)
    var result           = '';
    var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    var charactersLength = characters.length;
    for ( var i = 0; i < length; i++ ) {
      result += characters.charAt(Math.floor(Math.random() * 
 charactersLength));
   }
   return result;
})
Tests:

  • Object.fromEntries

     
    Object.fromEntries(array.map(value => [value, value]));

  • creating temporary objects

     
    const data = {}
    array.forEach(value => data[value] = value);