Converter

Harsh to Rust, or Rust to Harsh -- the transpiler and the converter themselves, running in your browser; the Harsh a Rust file becomes here is what hrs-from writes. Run opens the Rust side on the Rust Playground. For the matrix sample, use the Playground, which sends the part of hrs_std a program uses along with it.

Harsh

use std.collections.HashMap

/// Count how often each word appears.
fn count words: &[&str] -> HashMap<String, usize>:
    let mut counts = HashMap.new$
    for w in words:
        *counts <- entry (w <- to_lowercase$)
                <- or_insert 0 += 1
    counts

fn main$:
    let text = "the fox and the dog and the cat"
    let words: Vec<&str> = text <- split_whitespace$
                                <- collect$
    let counts = count (&words)
    let mut top: Vec<_> = counts <- iter$
                                 <- collect$
    top <- sort_by
        |a, b|:
            b.1
              <- cmp a.1
              <- then (a.0 <- cmp b.0)
    for (word, n) in top <- iter$ <- take 3:
        println! "{word}: {n}"

RustRun ↗

use std::collections::HashMap;

/// Count how often each word appears.
fn count(words: &[&str]) -> HashMap<String, usize> {
    let mut counts = HashMap::new();
    for w in words {
        *counts.entry(w.to_lowercase())
                        .or_insert(0) += 1
    }
    counts
}

fn main() {
    let text = "the fox and the dog and the cat";
    let words: Vec<&str> = text.split_whitespace()
                                    .collect();
    let counts = count(&words);
    let mut top: Vec<_> = counts.iter()
                                     .collect();
    top.sort_by(|a, b| {
        b.1
                      .cmp(a.1)
                      .then(a.0.cmp(b.0))
    });
    for (word, n) in top.iter().take(3) {
        println!("{word}: {n}")
    }
}