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That talks about using for…in with arrays, but not plain objects. IMO it’s fine for iterating over object keys. Sure, there are bizarre ways to make your objec

by pavlov 4y ago

That talks about using for…in with arrays, but not plain objects. IMO it’s fine for iterating over object keys. Sure, there are bizarre ways to make your objects go nuts in JavaScript through prototypal inheritance, but if you’re doing that then for…in is not your biggest problem.

IshKebab 4y ago
You shouldn't normally need to iterate over object keys. Doing so is a pretty big indication of bad design. If you do you should use `Object.entries()` which avoids enumerating properties in the prototype chain. There's really no reason at all to use for-in and its use is usually a mistake.
- pavlov 4y ago
  This is weird advice IMHO. It seems like you’re saying that iterating over dictionary keys is bad in general, not just in JavaScript. Doesn’t make any sense to me.
  - IshKebab 4y ago
    I'm not at all. If you want a map you should use `Map`. You generally shouldn't use `Object` as a map.