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Clarify byte literal usage in first_word example #4759

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7 changes: 4 additions & 3 deletions src/ch04-03-slices.md
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Expand Up @@ -64,9 +64,10 @@ for the index in the tuple and `&item` for the single byte in the tuple.
Because we get a reference to the element from `.iter().enumerate()`, we use
`&` in the pattern.

Inside the `for` loop, we search for the byte that represents the space by
using the byte literal syntax. If we find a space, we return the position.
Otherwise, we return the length of the string by using `s.len()`.
Inside the `for` loop, we check whether each byte is an ASCII space character
by comparing it to the byte literal `b' '`. The `b` prefix creates a byte
literal of type `u8`. If we find a space, we return the position. Otherwise,
we return the length of the string by using `s.len()`.

```rust,ignore
{{#rustdoc_include ../listings/ch04-understanding-ownership/listing-04-07/src/main.rs:inside_for}}
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