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Update for-expressions.md (#238)

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If we are introducing `for` loops, I think it is beneficial to show a very basic `for i=0; i < 10; i+=2` too.
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Igor Petruk 2023-01-23 12:04:42 +00:00 committed by GitHub
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src/control-flow/for-expressions.md
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@ -10,7 +10,19 @@ fn main() {
for x in v { for x in v {
println!("x: {x}"); println!("x: {x}");
} }
for i in (0..10).step_by(2) {
println!("i: {i}");
}
} }
``` ```
You can use `break` and `continue` here as usual. You can use `break` and `continue` here as usual.
<details>
* Index iteration is not a special syntax in Rust for just that case.
* `(0..10)` is a range that implements an `Iterator` trait.
* `step_by` is a method that returns another `Iterator` that skips every other element.
</details>