Do I correctly understand that there is no way to pass a local variable as an index in for-in loop so that this variable will be modified after loop ends?
var i = 0
for i in 0..<10 {
}
print(i)
// prints "0" but I expected "10"
-
See also stackoverflow.com/questions/33219684/…Grimxn– Grimxn2016-05-17 20:19:10 +00:00Commented May 17, 2016 at 20:19
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1 Answer
Correct. The way you've written it, the i in for i overshadows the var i inside the for loop scope. This is deliberate. There are many other ways to do what you want to do, though. For example, you might write something more like this:
var i = 0
for _ in 0..<10 {
i += 1
// ...
}
Or use a different name:
var i = 0
for ii in 0..<10 {
i = ii
// ...
}
Personally, I'd be more inclined here to use a while loop:
var i = 0
while i < 10 {
i += 1
// ...
}
A for loop can always be unrolled into a while loop, so there's no loss of generality here.
2 Comments
matt
There is no
++ in modern Swift, @CharlieMartin.
Vladislav Brylinskiy
Starting from swift 3 there won't be ++, @ CharlieMartin.