Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36
Chrome 79
Windows
Desktop
5 years ago
Test name Executions per second
Splice 11036329.0 Ops/sec
Spread 1864112.6 Ops/sec
Script Preparation code:
AخA
 
var array = Array.from({ length: 100 }).map((val, i) => i);
Tests:
  • Splice

     
    var newArray = array.slice(0, 0, 99);
  • Spread

     
    var newArray = [99, ...array];