Feature Request: high order functions (collection)

[RafaeLeal]

What is it?

Some special functions like filter, map, exists, all.

For example:

["project1/text.txt", "project2/text.txt"].exists(t => t.startsWith("project1"))
; => true

Why?

This would simplify a lot of some operations that would require very specific custom functions.

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Let me know if that's something you have thought about it.