Is there an idiomatic way of initialising arrays in Rust. I'm creating an array of random numbers and was wondering if there is a more idiomatic way then just doing a for loop. My current code works fine, but seems more like C than proper Rust:
let mut my_array: [u64; 8] = [0; 8];
for i in 0..my_array.len() {
my_array[i] = some_function();
}
Various sized arrays can be directly randomly generated:
use rand; // 0.7.3
fn main() {
let my_array: [u64; 8] = rand::random();
println!("{:?}", my_array);
}
Currently, this only works for arrays of size from 0 to 32 (inclusive). Beyond that, you will want to see related questions:
The other solution is nice and short, but does not apply to the case where you need to initialize an array of random numbers in a specific range. So, here's an answer that addresses that case.
use rand::{thread_rng, Rng};
fn main() {
let a = [(); 8].map(|_| thread_rng().gen_range(0.0..1.0));
println!("The array of random float numbers between 0.0 and 1.0 is: {:?}", a);
}
I would be happy to know if there's a better (shorter and more efficient) solution than this one.
float but the OP was asking about u64; looks like all you need to do is change 0.0..1.0 to 0..5555 or whatever your desired range is.