proposal: add rejectFirst

[DanielYWoo]

reject() iterates the whole list, can we stop once a matching one is found?

[MatthewVita]

Can you include a use case example?

[DanielYWoo]

Suppose you have a big list and you want to remove the first matching element, or you are sure that the list does not contain duplicated elements, using reject would traverse the whole list which is somehow slow. rejectFirst() should stop and return the first matching element.

[MatthewVita]

Not trying to be difficult, but this sounds like something that would best fit in underscore-contrib http://documentcloud.github.io/underscore-contrib/#why-underscore-contrib

My reasoning is that it is very specific/not very common (not saying it isn't useful).

I would appreciate another opinion here, however.

[Florian-R]

If #1545 was landed, we could have this almost for free I presume, but this PR seems stalled.

[akre54]

Yeah this sounds like a great fit for Underscore-contrib or a mixin for your own project. The primitives are all already there, you just gotta build on them.