node/benchmark/es/string-repeat.js at main · fetchapi/node · GitHub

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'use strict';

const assert = require('assert');

const common = require('../common.js');

const configs = {

n: [1e3],

mode: ['Array', 'repeat'],

encoding: ['ascii', 'utf8'],

size: [1e1, 1e3, 1e6],

};

const bench = common.createBenchmark(main, configs);

function main({ n, size, encoding, mode }) {

const character = encoding === 'ascii' ? 'a' : '\ud83d\udc0e'; // '🐎'

let str;

switch (mode) {

case 'Array':

bench.start();

for (let i = 0; i < n; i++)

str = new Array(size + 1).join(character);

bench.end(n);

break;

case 'repeat':

bench.start();

for (let i = 0; i < n; i++)

str = character.repeat(size);

bench.end(n);

break;

default:

throw new Error(`Unexpected method "${mode}"`);

}

assert.strictEqual([...str].length, size);

}

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