Run results for: map vs findIndex v2

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 Safari/537.36

Browser: Chrome 85

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
map	667.6 Ops/sec
findIndex	3285043.0 Ops/sec

Script Preparation code:

var arr = new Array(15000);
arr.fill({ id: 0 });
arr = arr.map((el, idx) => el.id = idx);
var foo = Math.floor(Math.random() * 15000);

Tests:

map
let new_a = {id: foo, new_a: true}; arr = arr.map(a => (a.id === foo ? new_a : a));
findIndex
let new_a = {id: foo, new_a: true}; let i = arr.findIndex(a => a.id = foo); arr[i] = new_a;