Benchmark: Cond map using for or array methods

Script Preparation code:

window.list = Array.from({length: 1000000}, () => Math.random())

Tests:

for
const a = [undefined] for (var i = 0; i < list.length; i++) { if (list[i + 1] > list[i]) { a[i + 1] = 'CLB' } else if (list[i + 1] < list[i]) { a[i + 1] = 'DESC' } else { a[i + 1] = 'CRZ' } }
map
const a = list.map((v, i, a) => v > a[i + 1] ? `DESC` : v < a[i + 1] ? `CLB` : `CRZ`, ) a.unshift(undefined)
map with n
const a = list.map((v, i, a, n = a[i + 1]) => v > n ? `DESC` : v < n ? `CLB` : `CRZ`, ) a.unshift(undefined)
map is on first
const a = list.map((v, i, a, n = a[i + 1]) => Object.is(v, n) ? `CRZ` : v > n ? `DESC` : `CLB`, ) a.unshift(undefined)

Rendered benchmark preparation results:

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Cond map using for or array methods (version: 0)