Comparison of forEach and map

perfTest_forEach_vs_Map.js

function arr(n) {
  return Array(n+1).join(1).split('');
}

const a = arr(1000000)

a[100] = 2
a[1000] = 2
a[10000] = 2

function timeit(label, cb) {
  console.profile(label)
  arr(100).forEach(() => {
    cb();
  })
  console.profileEnd()
}

const case1 = () => {
  a.map((val) => {
    if (val === 2) {
      console.log('it\'s 2 !');
    }
  })
}

const case2 = () => {
  a.forEach((val) => {
    if (val === 2) {
      console.log('it\'s 2 !');
    }
  })
}

timeit('map', case1);
timeit('forEach', case2);