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iOS

Posted by Michael touboul
Michael touboul
3,053 Points

index++

Hello everyone, i understand everything except one that is very confusing.. How come that the index value changed to 5 ??? the condition is as long as index is less then the "count" (count = 5 times) keep the loop going.. index++ is incrementing the value by one to index = 1, and not to 5, so how is it possible that it equals to 5 ???? this is freaking me out, please help!!!

Simon Coates
Simon Coates
28,695 Points

a URL or a code snippet would help give people an appreciation of what this is about.

1 Answer

Dave Berning
Dave Berning
17,365 Points
Dave Berning
Dave Berning
17,365 Points

I hope this answers your question. It can be a little tricky to grasp sometimes. Next time, please include a code snippet or resource so it is easier to understand your question.

var index: Int = 0
let count: Int = 5

while (index < count) {
    index += 1
}

/*  How while loops in Swift work...

Loop 1:
    index = 0
    index += 1
    index is now 1

    0 < 5 so it is TRUE

Loop 2:
    index = 1
    index += 1
    index is now 2

    1 < 5 so it is TRUE

 Loop 3:
    index = 2
    index += 1
    index is now 3

    2 < 5 so it is TRUE

 Loop 4:
    index = 3
    index += 1
    index is now 4

    3 < 5 so it is TRUE

 Loop 5:
    index = 4
    index += 1
    index is now 5

    4 < 5 so it is TRUE
*/

As you can see, the index variable does not equal 5 but it does loop through 5 times however. That is why in your results pane, you will see "(5 times)".