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'use strict'; const common = require('../common.js'); const assert = require('assert'); const bench = common.createBenchmark(main, { source: [ 'array', 'arraybuffer', 'arraybuffer-middle', 'buffer', 'string', 'string-utf8', 'string-base64', 'object', ], len: [100, 2048], n: [8e5] }); function main({ len, n, source }) { const array = new Array(len).fill(42); const arrayBuf = new ArrayBuffer(len); const str = 'a'.repeat(len); const buffer = Buffer.allocUnsafe(len); const uint8array = new Uint8Array(len); const obj = { length: null }; // Results in a new, empty Buffer let i = 0; switch (source) { case 'array': bench.start(); for (i = 0; i < n; i++) { Buffer.from(array); } bench.end(n); break; case 'arraybuffer': bench.start(); for (i = 0; i < n; i++) { Buffer.from(arrayBuf); } bench.end(n); break; case 'arraybuffer-middle': const offset = ~~(len / 4); const length = ~~(len / 2); bench.start(); for (i = 0; i < n; i++) { Buffer.from(arrayBuf, offset, length); } bench.end(n); break; case 'buffer': bench.start(); for (i = 0; i < n; i++) { Buffer.from(buffer); } bench.end(n); break; case 'uint8array': bench.start(); for (i = 0; i < n; i++) { Buffer.from(uint8array); } bench.end(n); break; case 'string': bench.start(); for (i = 0; i < n; i++) { Buffer.from(str); } bench.end(n); break; case 'string-utf8': bench.start(); for (i = 0; i < n; i++) { Buffer.from(str, 'utf8'); } bench.end(n); break; case 'string-base64': bench.start(); for (i = 0; i < n; i++) { Buffer.from(str, 'base64'); } bench.end(n); break; case 'object': bench.start(); for (i = 0; i < n; i++) { Buffer.from(obj); } bench.end(n); break; default: assert.fail('Should not get here'); } }