Table of Contents📚
- What is a vector❔
- Declaring a vector
- Declaring a vector with elements
- Accessing elements
- Joining elements
- Pushing elements
- Removing elements
Vectors
What is a vector❔
A vector is a data structure that can store a collection of data of the same type.
Declaring a vector
To declare an empty vector, use the Vec<T> type, where T is the type of the elements in the vector.
let mut string_vec: Vec<String> = Vec::new();
ℹ️ We have to make the vector mutable to be able change its elements.
ℹ️ We use the
Vec::new()method to create an empty vector.
Declaring a vector with elements
Declaring a vector with default values is much easier.
And we don’t need to specify the type of the elements.
let mut string_vec = vec!["Hello", "World"];
ℹ️ We use the
vec!macro to create a vector with the given elements.
Accessing elements
let mut string_vec = vec!["Hello", "World"];
println!("{} 👋", string_vec[0]);
ℹ️ We use the
[]operator to access the element at the given index.
Output:
Hello 👋
Joining elements
To join the elements of a vector with a specific separator, we can use the join method.
let mut string_vec = vec!["Hello", "World"];
println!("{}", string_vec.join("!"));
println!("{}", string_vec.join("->"));
println!("{}", string_vec.join(" "));
Output:
Hello!World
Hello->World
Hello World
Pushing elements
We can push elements to the end of the vector using the push method.
let mut string_vec = vec!["I", "Love"];
string_vec.push("Rust");
println!("{} 💖", string_vec.join(" "));
Output:
I Love Rust 💖
Removing elements
We can remove an element with its index using the remove method.
let mut string_vec = vec!["I", "Love", "Rust"];
string_vec.remove(1);
println!("{} 💖", string_vec.join(" "));
Output:
I Rust 💖