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benchmark: benchmark comparing forEach with for
PR-URL: #11582 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
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'use strict'; | ||
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const common = require('../common.js'); | ||
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const bench = common.createBenchmark(main, { | ||
method: ['for', 'for-of', 'for-in', 'forEach'], | ||
count: [5, 10, 20, 100], | ||
millions: [5] | ||
}); | ||
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function useFor(n, items, count) { | ||
var i, j; | ||
bench.start(); | ||
for (i = 0; i < n; i++) { | ||
for (j = 0; j < count; j++) { | ||
/* eslint-disable no-unused-vars */ | ||
var item = items[j]; | ||
/* esline-enable no-unused-vars */ | ||
} | ||
} | ||
bench.end(n / 1e6); | ||
} | ||
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function useForOf(n, items) { | ||
var i, item; | ||
bench.start(); | ||
for (i = 0; i < n; i++) { | ||
for (item of items) {} | ||
} | ||
bench.end(n / 1e6); | ||
} | ||
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function useForIn(n, items) { | ||
var i, j, item; | ||
bench.start(); | ||
for (i = 0; i < n; i++) { | ||
for (j in items) { | ||
/* eslint-disable no-unused-vars */ | ||
item = items[j]; | ||
/* esline-enable no-unused-vars */ | ||
} | ||
} | ||
bench.end(n / 1e6); | ||
} | ||
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function useForEach(n, items) { | ||
var i; | ||
bench.start(); | ||
for (i = 0; i < n; i++) { | ||
items.forEach((item) => {}); | ||
} | ||
bench.end(n / 1e6); | ||
} | ||
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function main(conf) { | ||
const n = +conf.millions * 1e6; | ||
const count = +conf.count; | ||
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const items = new Array(count); | ||
var i; | ||
var fn; | ||
for (i = 0; i < count; i++) | ||
items[i] = i; | ||
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switch (conf.method) { | ||
case 'for': | ||
fn = useFor; | ||
break; | ||
case 'for-of': | ||
fn = useForOf; | ||
break; | ||
case 'for-in': | ||
fn = useForIn; | ||
break; | ||
case 'forEach': | ||
fn = useForEach; | ||
break; | ||
default: | ||
throw new Error('Unexpected method'); | ||
} | ||
fn(n, items, count); | ||
} |