Swift: add Array.each (and here's why…)

Originator:radexpl
Number:rdar://17716661 Date Originated:
Status: Resolved:
Product: Product Version:
Classification: Reproducible:
 
Hi. I think you should add `each` method to collection types. I realize that Chris Lattner (IIRC) said on ADF that it's not really needed as you can just use for..in, but here's why I think `each` is useful:

You can chain `each` with operations such as `filter` and `map` in a much more elegant way, like so:

[1, 4, 7].map { $0 * 5 }.filter { $0 > 10 }.each { println($0) }

Very nice, very expressive. Sweet like Ruby. Compare to:

let filtered_nums = [1, 4, 7].map { $0 * 5 }.filter { $0 > 10 }
for num in filtered_nums {
   println(num)
}

Functional-style maps and filters combined with ObjC-style for. Meh.

Thanks for your consideration.

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