Run results for: Benchmark: flatMap vs reduce vs foreach

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36 Edg/142.0.0.0

Browser: Chrome 142

Operating system: Windows

Device Platform: Desktop

Date tested: 5 months ago

Test name	Executions per second
flatMap	60782.0 Ops/sec
reduce	12747.2 Ops/sec
foreach	219019.7 Ops/sec
for	109733.6 Ops/sec

Script Preparation code:

let e = () => ({
  eProp: 'E'
});

let t = () => ({
  tProp: 'T',
  entities: [1,2,3].map(() => e())
});

let g = () => ({
  gProp: 'B',
  tasks: [1,2,3,4,5,6,7,8,9].map(() => t())
});

let p = () => ({
  pProp: 'A',
  groups: [1,2,3,4,5,6].map(() => g())
});

var arr = [p(), p(), p()];

Tests:

flatMap
arr.flatMap(p => p.groups.flatMap(g => g.tasks.flatMap(t => t.entities)));
reduce
arr.reduce((prev, curr) => [ ...prev, ...curr.groups.reduce((gPrev, gCurr) => [ ...gPrev, ...gCurr.tasks.reduce((tPrev, tCurr) => [ ...tPrev, ...tCurr.entities ], []) ], []) ],[]);
foreach
let result = [] arr.forEach((p) => { p.groups.forEach((g) => { g.tasks.forEach((t) => { t.entities.forEach((e, i) => { result.push(e); }) }) }); });
for
let result2 = []; for (let i= 0; i< arr.length; i++) { for (let j= 0;j < arr[i].groups.length; j++) { for (let k= 0; k< arr[i].groups[j].tasks.length; k++) { for (let l= 0; l< arr[i].groups[j].tasks[k].entities.length; l++) { result2.push(arr[i].groups[j].tasks[k].entities[l]); } } } }

Run results for: Benchmark: flatMap vs reduce vs foreach

Loops through every entities item and adds a prop.

flatMap

reduce

foreach

for