rustHow to delete an entry from a Rust HashMap?

To delete an entry from a Rust HashMap, the remove method can be used. The remove method takes a key as an argument and returns the value associated with the key if it exists.

Example code

use std::collections::HashMap;

let mut scores = HashMap::new();

scores.insert(String::from("Blue"), 10);
scores.insert(String::from("Yellow"), 50);

let blue_score = scores.remove("Blue");

println!("Blue score: {:?}", blue_score);

Output example

Blue score: Some(10)

Code explanation

1. use std::collections::HashMap;: This imports the HashMap type from the std::collections module.

2. let mut scores = HashMap::new();: This creates a new empty HashMap called scores.

3. scores.insert(String::from("Blue"), 10);: This inserts a key-value pair into the HashMap, with the key being a String with the value "Blue" and the value being an i32 with the value 10.

4. let blue_score = scores.remove("Blue");: This removes the key-value pair with the key "Blue" from the HashMap and stores the associated value in the variable blue_score.

5. println!("Blue score: {:?}", blue_score);: This prints the value stored in blue_score to the console.

Helpful links

• Rust HashMap Documentation

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