exercism-rust/magazine-cutout/HINTS.md

Hints

General

• Upon fetching an entry using the entry method, the entry can be modified in-place after dereferencing it.

• The or_insert method inserts the given value in the case when the entry is vacant, and returns a mutable reference to the value in the entry.

*counter.entry(key).or_insert(0) += 1;

• The or_default method ensures a value is in the entry by inserting the default value if empty, and returns a mutable reference to the value in the entry.

*counter.entry(key).or_default() += 1;