Run results for: slice vs splice vs shift vs delete

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser: Chrome 136

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

splice

195.1M/s

slice

190.0M/s

shift

189.6M/s

delete

187.2M/s

View exact numbers

Script Preparation code:

var list = new Array(10*1000);
for (var i = 0; i < 10 * 1000; i++) {
  list[i]= i * Math.random();
}

Tests:

slice
while(list.length) { list = list.slice(1) }
shift
while(list.length) { list.shift() }
splice
while(list.length) { list.splice(0,1) }
delete
let i = 0 let ln= list.length while (i < ln) { list[i]; delete list[i]; i++ }