perf(runtime-dom): Array.from and concat is more efficient than ... #1367
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hello, in you test case and the result I get .... : |
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@buns-li I'm surprised it's not stable. that's interesting |
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it's stable in my chrome@83.0.4103.97 |
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@buns-li wtf.... Only God knows why. <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
let set = new Set()
set.add(1)
set.add(2)
set.add(3)
set.add(4)
let val = 0
console.log([val,...set])
console.log([val].concat(Array.from(set)))
console.time('...')
for (let i = 0; i < 10000; i++) {
let val1 = [val,...set]
}
console.timeEnd('...')
console.time('concat')
for (let i = 0; i < 10000; i++) {
let val2 = [val].concat(Array.from(set))
}
console.timeEnd('concat')
</script>
</body>
</html>
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forget it . It's not important logic. |
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I created a performance benchmark for this:
It seems that |
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@Justineo good job, thanks |
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https://codesandbox.io/s/xenodochial-fire-gdrkn?file=/src/index.js
