How to get vector length in Rust

In Rust, the vector is a fundamental data structure provided by the standard collection library. It serves as a dynamic array that can store values of the same data type.

To get the length of a vector in Rust, the len() method is used. It returns a number from 0 to the maximum value depending on the content of the vector.

Let's see the following code example to get the length of the vector.

Code example

fn main() {

    let mut fleet : Vec<&str> = Vec::new();

    fleet.push("Ford");

    fleet.push("Bentley");

    fleet.push("Jeep");



    println!("{:?}", fleet);

    println!("Number Of Cars : {}", fleet.len());

}

Code explanation

  • Line 2: We use Vec:new() to create a vector called fleet, which accepts only string values using Vec<&str>.

  • Lines 3–5: We add cars (values) to the fleet (vector) using fleet.push("value").

  • Line 7: We use {:?} to display all the values of the fleet vector.

  • Line 8: fleet.len() display the length of the vector or the number of values in the vector.

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