jeena/en.javascript.info
1
0
Fork 0
Code Issues Pull requests Projects Packages Wiki Activity Actions

Update article.md

Browse source 
The ol' evade -> avoid.
This commit is contained in:
paroche 2019-09-17 23:29:57 -06:00 • committed by GitHub
parent 646989dd47
commit 172d3dfb86
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 1 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

2
1-js/08-prototypes/04-prototype-methods/article.md
View file

@ -82,7 +82,7 @@ Why was `__proto__` replaced by the functions `getPrototypeOf/setPrototypeOf`? T
```warn header="Don't change `[[Prototype]]` on existing objects if speed matters" ```warn header="Don't change `[[Prototype]]` on existing objects if speed matters"
Technically, we can get/set `[[Prototype]]` at any time. But usually we only set it once at the object creation time, and then do not modify: `rabbit` inherits from `animal`, and that is not going to change. Technically, we can get/set `[[Prototype]]` at any time. But usually we only set it once at the object creation time, and then do not modify: `rabbit` inherits from `animal`, and that is not going to change.
And JavaScript engines are highly optimized to that. Changing a prototype "on-the-fly" with `Object.setPrototypeOf` or `obj.__proto__=` is a very slow operation, it breaks internal optimizations for object property access operations. So evade it unless you know what you're doing, or JavaScript speed totally doesn't matter for you. And JavaScript engines are highly optimized to that. Changing a prototype "on-the-fly" with `Object.setPrototypeOf` or `obj.__proto__=` is a very slow operation, it breaks internal optimizations for object property access operations. So avoid it unless you know what you're doing, or JavaScript speed totally doesn't matter for you.
``` ```
## "Very plain" objects [#very-plain] ## "Very plain" objects [#very-plain]