for-in statement

Question

TypeScript docs say nothing about loop like for or for-in. From playing with the language it seems that only any or string

Answer 1

The for-in statement is really there to enumerate over object properties, which is how it is implemented in TypeScript. There are some issues with using it on arrays.

I can't speak on behalf of the TypeScript team, but I believe this is the reason for the implementation in the language.