CODEWITHSUNDEEP
swiftswift3for-in-loop
MyBikeIsAwesome
MyBikeIsAwesome

Reputation: 215

How to skip iterations of a for-in loop (Swift 3)

Is it possible to skip iterations of a for-in loop in Swift 3?

I want to do something like this:

for index in 0..<100 {
    if someCondition(index) {
        index = index + 3 //Skip iterations here
    }
}

Upvotes: 8

Views: 6429

Answers (4)

Ivan Dyagilev
Ivan Dyagilev

Reputation: 11

Be it a .forEach for for-in, you have allways a reference to the current evaluated item. So you can decide on a per item base if you want to continue the iteration.

let numbers = [1,2,3,4,5,6,7]

numbers.forEach {
    guard $0 != 3 else { return }
    print($0)
}

If your question meant how to stop then have a look on 'break'. If the actual question is about stop when found a specific item, then have a look on .filter.

Upvotes: -1

Andreas
Andreas

Reputation: 161

Continue-statement will only skip once, which is not what was asked for.

A while-loop will work, but if you prefer not to use one:

var skipToIndex = 0

for index in 0...100 {

    if index < skipToIndex {
        continue
    }

    if someCondition {
        skipToIndex = index + 3 //Skip three iterations
    }
}

Upvotes: 1

RajeshKumar R
RajeshKumar R

Reputation: 15758

The easiest way is using continue within the if condition

       for index in 1...100
       {
            if index == 5
            {
               continue
            }
        print(index)//1 2 3 4 6 7 8 9 10
        }

Or 

for index in 1...10 where index%2 == 0
{
  print(index)//2 4 6 8 10
}

Upvotes: 20

Bryan Chen
Bryan Chen

Reputation: 46598

Simple while loop will do

var index = 0

while (index < 100) {
    if someCondition(index) {
        index += 3 //Skip 3 iterations here
    } else {
        index += 1
        // anything here will not run if someCondition(index) is true
    }
}

Upvotes: 10

Related Questions