How to get vector length in Rust (2024)

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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"); 
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  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.

RELATED TAGS

rust

CONTRIBUTOR

Olang Daniel

License:

Creative Commons-Attribution NonCommercial-ShareAlike 4.0 (CC-BY-NC-SA 4.0)

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