Hi, I'm a newbie learning Swift 3 using Apple's iBook The Swift Programming Language (Swift 3 Beta). I came upon "for in" loops and I can't quite grasp it. I know how a "for" loop works but the "for in" loops are really confusing me.
Could someone explain in detail what a "for in" loop does? Like step by step? Any help would be appreciated! Thanks!
Essentially, for ... in means :
for x in aRange { }
for all objects in aRange, do something, the curent object is x.
aRange may be just a range of numbers
for i in 10 ..<100 { } // 100 is excluded ; every integer is used (increment is 1)
or
for i in 10...100 { } // 100 is included
it may be much more, like an array
for elem in myArray { } // you explore all the items of the array
syntax may also use a where clause
for i in 10..<100 where i%2 == 0 { } // only even numbers will be used ; equivalent to a loop with increment of 2
You can also ask for reverse order and much more ; read the doc in detail, its very powerful
Thank you so much for answering!
Read what doc?
The doc is the Swift programming language (available on Swift.org).
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