stride(from: 0.0, to: 10.0, by: 2.0) using Float type instead of Double?

Question

When generating a sequence with stride, how do I pass type hint to Swift to use Float instead of Double?

let floats = Array(stride(from: -160.0, to: 0.0, by: 1.0)) // how to use Float instead of Double?

Vyacheslav · Answer 1 · 2018-08-03T10:33:07.893

1

let floats = Array(stride(from: Float(-160.0), to: Float(0.0), by: Float(1.0)))
print(type(of: floats.first!))

improved by comments:

let floats = Array(stride(from: Float(-160.0), to:0.0, by: 1.0))
print(type(of: floats.first!))

this is possible too

let strideTo: StrideTo<Float> = stride(from: -160.0, to: 0.0, by: 1.0)
let floats = Array(strideTo)

print(type(of: floats.first!))

Improved by Sulthan

let floats = Array(stride(from: -160.0 as Float, to: 0.0, by: 1.0))
print(type(of: floats.first!))

Array Generic syntax allows this:

let floats = Array<Float>(stride(from: -160.0, to: 0.0, by: 1.0))
print(type(of: floats.first!))

edited Aug 03 '18 at 10:33

answered Aug 03 '18 at 10:26

Vyacheslav

Is there not a cleaner way to do this than to repeat the type signature? – Petrus Theron Aug 03 '18 at 10:28
1

Its enough to do it once actually – Sulthan Aug 03 '18 at 10:29
Also, writing `0 as Float` is probably cleaner than invoking initializers. – Sulthan Aug 03 '18 at 10:31
@Sulthan what is the implementation difference between `Float(0)` and `0 as Float`? – Petrus Theron Aug 04 '18 at 08:06
1

@PetrusTheron `0 as Float` is a literal of type `Float`. `Float(0)` is a literal of type `Double` wrapped in `Float.init` call. – Sulthan Aug 04 '18 at 08:08

1 Answers1