To change all elements of an array in Rust 1.55, you can use a for loop or any other loop construct that iterates over the elements of the array. Here's an example using a for loop:
fn main() {
let mut array = [1, 2, 3, 4, 5];
for i in 0..array.len() {
array[i] *= 2;
}
println!("{:?}", array); // Output: [2, 4, 6, 8, 10]
}
In this example, we first initialize an array array with some values using array literal syntax. Then, we use a for loop to iterate over the indices of the array from 0 to array.len() - 1. Inside the loop, we multiply the value at each index by 2. Finally, we print the modified array using the println! macro.
Another way to change all elements of an array in Rust is to use the iter_mut() method and a closure:
fn main() {
let mut array = [1, 2, 3, 4, 5];
array.iter_mut().for_each(|x| *x *= 2);
println!("{:?}", array); // Output: [2, 4, 6, 8, 10]
}
In this example, we call the iter_mut() method on the array to get an iterator over mutable references to its elements. We then use the for_each() method on the iterator and pass it a closure that multiplies each element by 2 using dereferencing (*x). Finally, we print the modified array using the println! macro.