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Refactor: Discard unused next return value and update documentation in Chapter 13 #4179

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Refactor: Discard unused next return value and update documentation in Chapter 13 #4179

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2933e1e
Made it clear that the first item of the iterator is discarded
mavonarx Dec 24, 2024
0838afb
adjusted the text to "discard"
mavonarx Dec 24, 2024
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2 changes: 1 addition & 1 deletion listings/ch13-functional-features/listing-13-20/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@ impl Config {
pub fn build(
mut args: impl Iterator<Item = String>,
) -> Result<Config, &'static str> {
args.next();
let _ = args.next();

let query = match args.next() {
Some(arg) => arg,
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2 changes: 1 addition & 1 deletion src/ch13-03-improving-our-io-project.md
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Expand Up @@ -110,7 +110,7 @@ updates the code from Listing 12-23 to use the `next` method:

Remember that the first value in the return value of `env::args` is the name of
the program. We want to ignore that and get to the next value, so first we call
`next` and do nothing with the return value. Second, we call `next` to get the
`next` and discard the return value. Second, we call `next` to get the
value we want to put in the `query` field of `Config`. If `next` returns a
`Some`, we use a `match` to extract the value. If it returns `None`, it means
not enough arguments were given and we return early with an `Err` value. We do
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