Index of element in Rust 1.55

In Rust, you can get the index of an element in an array by using the iter() method and the position() method. The iter() method returns an iterator over the elements of an array, while the position() method returns the position of the first element that satisfies a given predicate.

Here's an example code snippet to demonstrate getting the index of an element in an array in Rust 1.55:

fn main() {
    let fruits = ["apple", "banana", "orange", "grape", "pear"];
// Find the position of "orange" in the array

    let position = fruits.iter().position(|&x| x == "orange");
match position {

        Some(i) => println!("The index of 'orange' is: {}", i),

        None => println!("'orange' is not in the array."),

    }

}

In this example, the fruits array contains five elements. We use the iter() method to create an iterator over the elements of the fruits array and then use the position() method to find the position of the element that matches the string "orange". The position() method returns an Option value, which represents the position of the element if it is found in the array, and None if it is not found.

We then use a match statement to pattern match on the Option value and print out the index if it is found, or a message if it is not found.

If you run this code, the output will be:

The index of 'orange' is: 2

which indicates that "orange" is at position 2 in the fruits array.