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Programming-Idioms

History of Idiom 195 > diff from v7 to v8

Edit summary for version 8 by Kacper:
New Rust implementation by user [Kacper]
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Version 7

2020-10-23, 17:30:59

Version 8

2021-06-09, 10:32:27

Idiom #195 Pass a two-dimensional array

Pass an array a of real numbers to the procedure (resp. function) foo. Output the size of the array, and the sum of all its elements when each element is multiplied with the array indices i and j (assuming they start from one).

Idiom #195 Pass a two-dimensional array

Pass an array a of real numbers to the procedure (resp. function) foo. Output the size of the array, and the sum of all its elements when each element is multiplied with the array indices i and j (assuming they start from one).

Variables
a,foo,i,j
Variables
a,foo,i,j
Imports 
#[macro_use] extern crate itertools;
Code 
fn foo(a: Vec<Vec<usize>>) {
    println!(
        "Length of array: {}",
        a.clone()
            .into_iter()
            .flatten()
            .collect::<Vec<usize>>()
            .len()
    );

    let mut sum = 0;
    for (i, j) in izip!(&a[0], &a[1]) {
        sum += i * j
    }

    println!("Sum of all products of indices: {}", sum);
}
Comments bubble
By useing izp! macro we can chain itteration over elements of array a
Demo URL
https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=3b8467a7c42791a253439d3a6e06db11