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some mutation methods of Array cause infinite recursion #2137

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unbyte opened this issue Sep 17, 2020 · 6 comments · Fixed by #2138
Closed

some mutation methods of Array cause infinite recursion #2137

unbyte opened this issue Sep 17, 2020 · 6 comments · Fixed by #2138

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@unbyte
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unbyte commented Sep 17, 2020 •
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Version

3.0.0-rc.12

Reproduction link

https://codepen.io/unbyte/pen/ExKePMY

Steps to reproduce

  1. open the terminal

What is expected?

effects should only run one time, cuz no reactive dep has changed

What is actually happening?

infinite recursive update

I've fixed it by #2135 , however it was closed by some misunderstanding.

I've created another PR #2138 to fix it.

This recursion is not due to the self-calls of the effect, but that push changes .length while it depends on .length (however this dependency is not really needed)
@unbyte unbyte mentioned this issue Sep 17, 2020
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@unbyte unbyte changed the title Array.prototype.push causes infinite recursion Array.prototype.push/pop/shift/unshift causes infinite recursion Sep 17, 2020
@unbyte unbyte changed the title Array.prototype.push/pop/shift/unshift causes infinite recursion Array.prototype.push/pop/shift/unshift cause infinite recursion Sep 17, 2020
@dsonet
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dsonet commented Sep 17, 2020

What about method splice?

@CyberAP
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CyberAP commented Sep 17, 2020

This is expected since your effect is mutating its dependency.

@unbyte
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unbyte commented Sep 17, 2020

@CyberAP I don't think it's reasonable, operating one array in two effects leads to infinite recursive call, it sounds crazy 😂

@unbyte unbyte changed the title Array.prototype.push/pop/shift/unshift cause infinite recursion some mutation methods of Array cause infinite recursion Sep 17, 2020
@CyberAP
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CyberAP commented Sep 17, 2020

You'll get the same result in Vue 2, the problem here is with the logic of the code, not with the Vue's API.

@unbyte
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unbyte commented Sep 18, 2020

@CyberAP any repro in Vue 2? 😲

yyx990803 added a commit that referenced this issue Sep 18, 2020
@unbyte @yyx990803
fix(reactivity): avoid length mutating array methods causing infinite…
f316a33 
… updates (#2138)

fix #2137

Co-authored-by: Evan You <[email protected]>
@hyf0
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hyf0 commented May 21, 2021

I don't consider it as a bug or something need to fix. That's how it should be. It looks similar to #3653.

@okbug okbug mentioned this issue Jun 20, 2022
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fix(reactivity): some mutation methods of Array cause infinite recursion
4 participants
@dsonet @CyberAP @unbyte @hyf0