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update notes on the approach using the spread operator for inline updating

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mdgriffith 2020-08-21 09:54:23 -04:00
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notes/transformations.md
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@ -250,13 +250,19 @@ with
Object.assign({}, old, newFields)
```
Or we can use the spread operator inline:
```
{...old, ...new}
```
## Result Summary
- Not included in elm-optimize tool
- Again, all of these tricks rely on either the spread operator or `Object.assign`, both of which are not supported in IE.
- The most promising approach was inlining the call completely with `Object.assign`.
- Gave a `366%` boost in chrome!
- And caused firefox to reduce performance by 50% :sweat_smile:
- The most promising approach was inlining the call completely with `{...old, field: newValue}`.
- Gave a `501%` boost in chrome!
- And caused safari to reduce performance by 50% :sweat_smile:
Simply creating a new record and copying each field manually is significantly faster than and of these transformations.(~9x in chrome, and ~6.5x in firefox). You can do this directly in elm.