Using Stride in Swift 2.0

Question

I'm trying to figure out how to use the Stride features in Swift.

It seems to have changed again, since Xcode 7.0 beta 6.

Previously I could use

let strideAmount = stride(from: 0, to: items.count, by: splitSize)
let sets = strideAmount.map({ clients[$0..<advance($0, splitSize, items.count)] })

Now, despite the code hint I cannot figure out how to use this feature.

Any examples would be helpful thanks.

I've looked at examples, but I cannot come to grips with how to use it. All I get from the Apple Docs are limited.

Thanks

stride is used for generating one number for inner function, so it can't be simply used for splicing arrays because you need to numbers(start & end indexes) for that — maxpovver, Aug 25 '15 at 06:54
@maxpovver so using it for this is a bad idea http://stackoverflow.com/questions/26395766/swift-what-is-the-right-way-to-split-up-a-string-resulting-in-a-string-wi — DogCoffee, Aug 25 '15 at 09:08

Dániel Nagy · Accepted Answer · 2016-09-26T07:20:49.410

67

It changed a bit, here is the new syntax:

0.stride(to: 10, by: 2)

and

Array(0.stride(to: 10, by: 2)) // is [0, 2, 4, 6, 8]

if you take a look at here, you can see what types conform to the Strideable protocol.

As @RichFox pointed out, in Swift 3.0 the syntax changed back to the original global function form like:

stride(from:0, to: 10, by: 2)

edited Sep 26 '16 at 07:20

answered Aug 25 '15 at 07:34

Dániel Nagy

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I did not know of SwiftDoc - bonus! Thanks – DogCoffee Aug 25 '15 at 10:14
1

syntax is now global function again... `stride(from:0, to: 10, by: 2)` for example you can : `for i in stride(from:0, to: 10, by: 2) { print(i) }` – Rich Fox Sep 26 '16 at 02:47
`let array = Array(1...10)` or `let array = Array(1..<10)`, @DánielNagy I just want to know the advantages of stride while we can use closed rages and open ranges like I mentioned here. – abhimuralidharan Jun 30 '17 at 08:39
1

@abhi1992 I did not checked it before, but I think the constructor which you described was added in Swift 3 as well. IMO using `stride` makes sense only if you are not creating a sequence with consecutive elements, otherwise I would use `Array(1...10)` since it's shorter. – Dániel Nagy Jul 01 '17 at 11:23

score 1 · Answer 2 · answered Nov 12 '19 at 05:11

Usage of stride function in swift 4.2

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for i in 1...5{
    for k in 1...i{
        print(terminator : " ")
    }
    for j in stride(from: i, to: 6, by: 1){
        print(j , terminator : "")
    }

    print(" ")
}
for i in stride(from: 5, to: 0, by: -1)
{
    for k in 1...i{
        print(terminator : " ")
    }
    for j in stride(from: i, to: 6, by: 1){
        print(j,terminator : "")
    }
    print(" ")
}
1 2 3 4 5
 2 3 4 5
  3 4 5
   4 5
    5
    5
   4 5
  3 4 5
 2 3 4 5
1 2 3 4 5
for i in 1...5{
    for k in 0...i{
        print(terminator : " ")
    }
    for j in stride(from: i, to: 6, by: 1){
        print(j , terminator : " ")
    }

    print(" ")
}

for i in stride(from: 6, to: 1, by: -1){
    for k in 1...i{
        print(terminator : " ")
    }
    for j in stride(from: i-1, to: 6, by: 1){
        print(j , terminator : " ")
    }

    print(" ")
}

Using Stride in Swift 2.0

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