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benchmark: add benchmark for object properties
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Adds a benchmark to compare the speed of property setting/getting in
four cases:
- Dot notation: `obj.prop = value`
- Bracket notation with string: `obj['prop'] = value`
- Bracket notation with string variable: `obj[prop] = value`
- Bracket notation with Symbol variable: `obj[sym] = value`

PR-URL: #10949
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
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targos authored and evanlucas committed Jan 31, 2017
1 parent c1e166a commit 1e0294c
Showing 1 changed file with 81 additions and 0 deletions.
81 changes: 81 additions & 0 deletions benchmark/misc/object-property-bench.js
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'use strict';

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

const bench = common.createBenchmark(main, {
method: ['property', 'string', 'variable', 'symbol'],
millions: [1000]
});

function runProperty(n) {
const object = {};
var i = 0;
bench.start();
for (; i < n; i++) {
object.p1 = 21;
object.p2 = 21;
object.p1 += object.p2;
}
bench.end(n / 1e6);
}

function runString(n) {
const object = {};
var i = 0;
bench.start();
for (; i < n; i++) {
object['p1'] = 21;
object['p2'] = 21;
object['p1'] += object['p2'];
}
bench.end(n / 1e6);
}

function runVariable(n) {
const object = {};
const var1 = 'p1';
const var2 = 'p2';
var i = 0;
bench.start();
for (; i < n; i++) {
object[var1] = 21;
object[var2] = 21;
object[var1] += object[var2];
}
bench.end(n / 1e6);
}

function runSymbol(n) {
const object = {};
const symbol1 = Symbol('p1');
const symbol2 = Symbol('p2');
var i = 0;
bench.start();
for (; i < n; i++) {
object[symbol1] = 21;
object[symbol2] = 21;
object[symbol1] += object[symbol2];
}
bench.end(n / 1e6);
}

function main(conf) {
const n = +conf.millions * 1e6;

switch (conf.method) {
case 'property':
runProperty(n);
break;
case 'string':
runString(n);
break;
case 'variable':
runVariable(n);
break;
case 'symbol':
runSymbol(n);
break;
default:
throw new Error('Unexpected method');
}
}

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