The `for` is a very ergonomic syntax to mapping a computation to every element of a sequence. The `while` does a really different thing, it's not about sequences at all, but about checking some bit of mutable state repeatedly.
> The `for` is a very ergonomic syntax to mapping a computation to every element of a sequence.
The very ergonomic solution to map a computation to every element of a sequence is `map`. In this case, `for` is filled with bookkeeping that does not matter.
I edited out "syntax sugar" that was in the post initially.
Also, the `for` operator definitely predates the `map` function. Some people also prefer `map` to be more or less pure and expect it to return a usable list; `for ` has no such expectation, it e.g. may consist solely in printing elements.
