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'use strict'; const common = require('../common.js'); const bench = common.createBenchmark(main, { method: ['for', 'for-of', 'for-in', 'forEach'], count: [5, 10, 20, 100], n: [5e6] }); function useFor(n, items, count) { bench.start(); for (var i = 0; i < n; i++) { for (var j = 0; j < count; j++) { // eslint-disable-next-line no-unused-vars const item = items[j]; } } bench.end(n); } function useForOf(n, items) { bench.start(); for (var i = 0; i < n; i++) { // eslint-disable-next-line no-unused-vars for (const item of items) {} } bench.end(n); } function useForIn(n, items) { bench.start(); for (var i = 0; i < n; i++) { for (var j in items) { // eslint-disable-next-line no-unused-vars const item = items[j]; } } bench.end(n); } function useForEach(n, items) { bench.start(); for (var i = 0; i < n; i++) { items.forEach((item) => {}); } bench.end(n); } function main({ n, count, method }) { const items = new Array(count); var fn; for (var i = 0; i < count; i++) items[i] = i; switch (method) { case '': // Empty string falls through to next line as default, mostly for tests. 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 "${method}"`); } fn(n, items, count); }