Run results for: reduce vs flatMap test3

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.135 YaBrowser/21.6.2.867 Yowser/2.5 Safari/537.36

Browser: Yandex Browser 21

Operating system: Mac OS X 10.15.6

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
reduce with forEach	7783.9 Ops/sec
flatMap	300.0 Ops/sec
reduce with forEach (directly)	1278.2 Ops/sec
flat	297.6 Ops/sec
reduce with apply	590.2 Ops/sec
for with foreach	649.5 Ops/sec
for with apply	339.6 Ops/sec
nested for	752.1 Ops/sec
reduce with while	11774.5 Ops/sec
while with foreach	1066.4 Ops/sec
while with apply	441.7 Ops/sec
while with for	1409.6 Ops/sec
nested while	1504.4 Ops/sec
nested reduce	7844.0 Ops/sec

Script Preparation code:

var arr = new Array(10000).fill([1,2]);

Tests:

reduce with forEach
arr.reduce((res, x) => { x.forEach(item => {res.push(item)}) return res; },[]);
flatMap
arr.flatMap(x => x);
reduce with forEach (directly)
arr.reduce((res, x) => { x.forEach(res.push, res); return res; },[]);
flat
arr.flat();
reduce with apply
arr.reduce((res, x) => { Array.prototype.push.apply(res, x); return res; },[]);
for with foreach
const res = []; for (let i = 0; i < arr.length ; i++) { arr[i].forEach(res.push, res); }
for with apply
const res = []; for (let i = 0; i < arr.length ; i++) { Array.prototype.push.apply(res, arr[i]); }
nested for
const res = []; for (let i = 0; i < arr.length ; i++) { const x = arr[i]; for (let j = 0; j < x.length; j++) { res.push(x[j]); } }
reduce with while
arr.reduce((res, x) => { let i = x.length; while (--i > 0) { res.push(x[i]); } return res; },[]);
while with foreach
const res = []; let i = arr.length; while (--i > 0) { arr[i].forEach(res.push, res); }
while with apply
const res = []; let i = arr.length; while (--i > 0) { Array.prototype.push.apply(res, arr[i]); }
while with for
const res = []; let i = arr.length; while (--i > 0) { const x = arr[i]; for (let j = 0; j < x.length; j++) { res.push(x[j]); } }
nested while
const res = []; let i = arr.length; while (--i > 0) { const x = arr[i]; let j = x.length; while(--j > 0) { res.push(x[j]); } }
nested reduce
arr.reduce((res, x) => x.reduce((acc, y) => { acc.push(y); return acc; }, res),[]);

Run results for: reduce vs flatMap test3

reduce with forEach

flatMap

reduce with forEach (directly)

flat

reduce with apply

for with foreach

for with apply

nested for

reduce with while

while with foreach

while with apply

while with for

nested while

nested reduce