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Memoize input and meta #640

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asazernik
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Preventing unnecessary re-renders is the name of the game. Users will only see gains if they pass in a pure/memoized component, but if they do it's a big difference.

The rule against nesting of hook calls requires us to change the
structure of this code somewhat.
If the child components of <Field> check for reference equality of their
props to decide to re-render, the old code was causing excessive
re-renders by changing the identity of input and meta props.
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codecov bot commented Oct 1, 2019

Codecov Report

Merging #640 into master will not change coverage.
The diff coverage is 100%.

Impacted file tree graph

@@          Coverage Diff          @@
##           master   #640   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          17     17           
  Lines         251    257    +6     
  Branches       58     57    -1     
=====================================
+ Hits          251    257    +6
Impacted Files Coverage Δ
src/useField.js 100% <100%> (ø) ⬆️

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@asazernik
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asazernik commented Oct 21, 2019

Note on second glance - because of extensive whitespace changes, the diffs are best viewed with --color-words --ignore-space-change

@erikras
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erikras commented Oct 28, 2019

Can you show me a render counting test that passes if meta and input are memoized but fails if they are not?

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2 participants