Rust Tutorials

How to Iterate Over a Vector with Index in Rust

How to Iterate Over a Vector with Index in Rust ?

Answer

To iterate over a vector with index in Rust, you can use the .iter().enumerate() method, which provides both the index and the value of each element in the vector.

✐ Examples

1 Iterate Over a Numeric Vector with Index

In this example,

We create a vector named num_vec containing several numeric values using the vec! macro.
We use a for loop to iterate over the vector. The .iter().enumerate() method is used to get an iterator that yields pairs of the index and reference to each element in the vector.
Within the loop, each iteration gives us a tuple (index, value). The index is of type usize, and the value is a reference to the element in the vector.
We use the println! macro to print both the index and the value in each iteration.
This approach ensures we can access both the index and the value of each element during iteration.

Rust Program

fn main() {
    let num_vec = vec![10, 20, 30, 40, 50];
    for (index, value) in num_vec.iter().enumerate() {
        println!("Index: {} Value: {}", index, value);
    }
}

Output

Index: 0 Value: 10
Index: 1 Value: 20
Index: 2 Value: 30
Index: 3 Value: 40
Index: 4 Value: 50

2 Iterate Over a String Vector with Index

In this example,

We create a vector named str_vec containing several string slices using the vec! macro.
We use a for loop to iterate over the vector. The .iter().enumerate() method is used to get an iterator that yields pairs of the index and reference to each element in the vector.
Within the loop, each iteration provides us with a tuple (index, value). The index is of type usize, and the value is a reference to the string slice in the vector.
We use the println! macro to print both the index and the value in each iteration.
This allows us to access both the index and the value of each string slice in the vector.

Rust Program

fn main() {
    let str_vec = vec!["apple", "banana", "cherry", "date"];
    for (index, value) in str_vec.iter().enumerate() {
        println!("Index: {} Value: {}", index, value);
    }
}

Output

Index: 0 Value: apple
Index: 1 Value: banana
Index: 2 Value: cherry
Index: 3 Value: date

Summary

In this tutorial, we learned How to Iterate Over a Vector with Index in Rust language with well detailed examples.

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How to Iterate Over a Vector with Index in Rust

How to Iterate Over a Vector with Index in Rust ?

Answer

✐ Examples

1 Iterate Over a Numeric Vector with Index

Rust Program

Output

2 Iterate Over a String Vector with Index

Rust Program

Output

Summary

More Rust Vectors Tutorials