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perf: isPlainObject: add quick comparison between input and Object to short-circuit taxing Function.toString invocations #805

merged 1 commit into from Jun 9, 2021


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@benelliott benelliott commented May 26, 2021

Fixes #804

…to short-circuit taxing `Function.toString` invocations
@mweststrate mweststrate merged commit 07575f3 into immerjs:master Jun 9, 2021
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@mweststrate mweststrate commented Jun 9, 2021

Thanks for optimising this!

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@mweststrate mweststrate commented Jun 9, 2021

🎉 This PR is included in version 9.0.3 🎉

The release is available on:

Your semantic-release bot 📦🚀

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@markerikson markerikson commented Jun 9, 2021

FWIW, here's the implementation that Redux uses:

 * @param obj The object to inspect.
 * @returns True if the argument appears to be a plain object.
export default function isPlainObject(obj: any): boolean {
  if (typeof obj !== 'object' || obj === null) return false

  let proto = obj
  while (Object.getPrototypeOf(proto) !== null) {
    proto = Object.getPrototypeOf(proto)

  return Object.getPrototypeOf(obj) === proto

I believe this also correctly handles cross-frame behavior. If I remember right, @timdorr implemented this. Backstory:

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3 participants