Chapter 10-00 Listing 10-3: Usage of pattern matching in for loops

[digitalillusions]

Hi, first of all I have to say I love the book. In my opinion its really well written and provides a nice introduction.

While reading I stumbled a little when the challenge was posed in Chapter 10-02 after listing 10-15, specifically the for loop, which reads:

    for &item in list.iter() {
        if item > largest {
            largest = item;
        }
    }

Specifically the line

for &item in list.iter() {

I do not remember coming across the concept of using an & in from of an item in a range based for loop in rust, even after asking some colleagues (who have worked with rust for nearly 3 years). I think this kind of destructuring or pattern matching should be mentioned at some point in the explaining text, maybe also with reference to Chapter 18-01. I might have missed it in my haste at some point, but explaining this also makes the explanation of the Copy trait a lot more obvious to me. I think this was already mentioned in #2121 although I think the focus there was on the copy trait.

Another thing that I noticed, was that while moving from Listing 10-3 to Listing 10-4 the code suddenly got extended from

for &item in list {

to

for &item in list.iter() {

Hope this can help to make the already amazing rust book a little better.

[steveklabnik]

Hey there, thanks so much!

#2363 should have fixed this!