Created
March 22, 2022 02:16
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for loop comparison - probably poor benchmarking on my part
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| (function() { | |
| let array = []; | |
| for (let i = 0; i < 10000000; ++i) { | |
| array.push({ | |
| a: i, | |
| b: i / 2, | |
| r: 0, | |
| }); | |
| } | |
| function whileLoop() { | |
| let i = 0; | |
| while (i < array.length) { | |
| let x = array[i]; | |
| x.r = x.a + x.b; | |
| i++; | |
| } | |
| } | |
| function forEach() { | |
| array.forEach(x => { | |
| x.r = x.a + x.b; | |
| }); | |
| } | |
| function forOf() { | |
| for (let x of array) { | |
| x.r = x.a + x.b; | |
| } | |
| } | |
| function forIn() { | |
| for (let i = 0; i < array.length; i++) { | |
| let x = array[i]; | |
| x.r = x.a + x.b; | |
| } | |
| } | |
| function forInWithCache() { | |
| for (let i = 0, length = array.length; i < length; i++) { | |
| let x = array[i]; | |
| x.r = x.a + x.b; | |
| } | |
| } | |
| function timeIt(fn, name) { | |
| console.log("________", name); | |
| for (let i = 0; i < 20; i++) { | |
| let print = i === 0 ? " first time" : i === 19 ? " optimized" : ""; | |
| print && console.time(name + print); | |
| fn(); | |
| print && console.timeEnd(name + print); | |
| } | |
| } | |
| timeIt(forOf, "for-of"); | |
| timeIt(forIn, "for-in"); | |
| timeIt(forInWithCache, "for-in w/cache"); | |
| timeIt(forEach, "forEach"); | |
| timeIt(whileLoop, "while loop"); | |
| })(); |
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