[rubiquity]

What features of Swift do you find functional? What kind of functional features are you using? I'm asking out of genuine curiosity, not to put you on the spot. Thanks!

[bitpew]

Not to speak for the OP, but two features bear resemblance to functional programming languages:

1) Function Types ( = higher order functions)

This allows functions to be passed around as function parameters or return values.

2) Immutable variables via let

let a = 1 // a is always bound to the constant 1

a = 2 // error

[emsy]

I couldn't find any built in list/map/set comprehension. Did they leave it out or did I just miss it?

[dilap]

A big one is sum types (which it calls enum, a la rust), which come from ML.