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Remove to_string from HashMap example (#1979)

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While it's generally better in Rust code to use `String` as the key type
for a `HashMap` than `&str`, for the purposes of our examples having the
extra `to_string` calls makes the example more verbose and confusing for
students. The simple example will work as-is without the `to_string`
calls, so I think it's better to just remove them.
This commit is contained in:
Nicole L 2024-04-12 10:17:20 -07:00 committed by GitHub
parent 04c28ed641
commit 8433ad9a3d
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1 changed files with 4 additions and 4 deletions
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8
src/std-types/hashmap.md
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@ -11,9 +11,9 @@ use std::collections::HashMap;
fn main() {
let mut page_counts = HashMap::new();
page_counts.insert("Adventures of Huckleberry Finn".to_string(), 207);
page_counts.insert("Grimms' Fairy Tales".to_string(), 751);
page_counts.insert("Pride and Prejudice".to_string(), 303);
page_counts.insert("Adventures of Huckleberry Finn", 207);
page_counts.insert("Grimms' Fairy Tales", 751);
page_counts.insert("Pride and Prejudice", 303);
if !page_counts.contains_key("Les Misérables") {
println!(
@ -31,7 +31,7 @@ fn main() {
// Use the .entry() method to insert a value if nothing is found.
for book in ["Pride and Prejudice", "Alice's Adventure in Wonderland"] {
let page_count: &mut i32 = page_counts.entry(book.to_string()).or_insert(0);
let page_count: &mut i32 = page_counts.entry(book).or_insert(0);
*page_count += 1;
}