> On 28 Jul 2017, at 17:19, Kwanghoon Choi via swift-evolution
> <swift-evolution@swift.org> wrote:
>
> Hello
>
> I found someone easy mistake using for in loop statement.
>
> Ex)
> var i = 0
> for i in 0..<10 { }
> print(i)
>
> And this user expected print(i) is “10”
The variable shadows any reference in the loop; and in addition, it's a
constant value.
1> for i in 0..<10 { i+=1 }
error: repl.swift:7:20: error: left side of mutating operator isn't mutable:
'i' is a 'let' constant
for i in 0..<10 { i+=1 }
~^
> Many experienced swift developers doesn’t misunderstand like this. But always
> someone is new comers, and I think this expression make misunderstand easy
> too.
>
> So why not like this?
>
> var I = 0
> for 0..<10 { (i) in … }
You can already do this:
2> (0..<10).forEach { i in print(i) }
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