Rust

5.5    HashMaps

Let’s say you want to store information about some words along with their frequencies or counts. One way to store this information is by using two vectors. The first vector will contain the words, and the second will contain their counts, as follows:

let words = vec!["Hello", "world", "Rust", "Programming"];let counts = vec![5, 2, 15, 5];  

This example is another scenario that works but is not efficient. To find the frequency of a particular word, you would need to write logic that first searches for the word in the vector. If found, we then retrieve the count using the correct index. Additionally, managing two separate vectors can be cumbersome.

A better solution is to use a single vector where each element is a tuple containing ...