CODEWITHSUNDEEP
arraysswift
Nils
Nils

Reputation: 313

Create list of integers on an interval

I want to create a list of integers on an interval increasing with a certain step, for example [0,1,2,3,4,5,6,7,8,9,10]. How could I do this without creating a separate method?

Upvotes: 2

Views: 356

Answers (1)

Eric Aya
Eric Aya

Reputation: 70111

Swift 2

To create an array of Ints in sequence you can use a "range":

let a = Array(0...10)  // [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Here 0...10 makes the Range and the Array initializer makes the Range into an Array of Ints.

There's also this variant:

let a = Array(0..<10)  // [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

And to do the same thing but with a different stepping, you can use "stride":

let b = Array(0.stride(through: 10, by: 2))  // [0, 2, 4, 6, 8, 10]

Here stride starts on 0 and goes through 10 by steps of 2.

It also has a variant:

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

Swift 3

The syntax for stride has changed, now it's a free function.

let b = Array(stride(from: 0, through: 10, by: 2))  // [0, 2, 4, 6, 8, 10]
let b = Array(stride(from: 0, to: 10, by: 2))  // [0, 2, 4, 6, 8]

Upvotes: 4

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