ffbad8350eBenchmark comparing `util._extend()`, `Object.assign()`, and the spread operator for object assignment. `util._extend()` still wins currently. PR-URL: https://github.com/nodejs/node/pull/18442 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Weijia Wang <starkwang@126.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
46 lines
1,012 B
JavaScript
46 lines
1,012 B
JavaScript
'use strict';
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const common = require('../common.js');
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const util = require('util');
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const bench = common.createBenchmark(main, {
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method: ['spread', 'assign', '_extend'],
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count: [5, 10, 20],
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millions: [1]
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});
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function main({ millions, context, count, rest, method }) {
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const n = millions * 1e6;
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const src = {};
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for (let n = 0; n < count; n++)
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src[`p${n}`] = n;
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let obj; // eslint-disable-line
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let i;
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switch (method) {
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case '':
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// Empty string falls through to next line as default, mostly for tests.
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case '_extend':
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bench.start();
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for (i = 0; i < n; i++)
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obj = util._extend({}, src);
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bench.end(n);
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break;
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case 'assign':
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bench.start();
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for (i = 0; i < n; i++)
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obj = Object.assign({}, src);
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bench.end(n);
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break;
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case 'spread':
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bench.start();
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for (i = 0; i < n; i++)
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obj = { ...src };
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bench.end(n);
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break;
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default:
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throw new Error('Unexpected method');
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}
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}
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