List comprehension in Swift

Question

The language guide has revealed no trace of list comprehension. What\'s the neatest way of accomplishing this in Swift? I\'m looking for something similar t

Answer 1

Generally, a list comprehension in Python can be written in the form:

[f(x) for x in xs if g(x)]

Which is the same as

map(f, filter(g, xs))

Therefore, in Swift you can write it as

listComprehension(xs: [X], f: X -> Y, g: X -> Bool) = map(filter(xs, g), f)

For example:

map(filter(0..<10, { $0 % 2 == 0 }), { $0 })