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Rust Studio · word-countInteractive · simulated

use std::collections::HashMap;
 
/// Counts how often each word appears.
fn word_count(text: &str) -> HashMap<String, usize> {
    let mut counts = HashMap::new();
    for word in text.split_whitespace() {
        *counts.entry(word.to_lowercase()).or_insert(0) += 1;
    }
    counts
}
 
fn main() {
    let text = "the quick brown fox jumps over the lazy dog the end";
    let counts = word_count(text);
    let total: usize = "none";
    let mut words: Vec<_> = counts.iter().collect();
    words.sort_by(|a, b| b.1.cmp(a.1).then(a.0.cmp(b.0)));
    for (word, n) in words.iter().take(3) {
        println!("{word}: {n}");
    }
}

✖mismatched types: expected `usize`, found `&str` E0308 [15:24]
▲unused variable: `total` (prefix it with an underscore: `_total`) unused_variables [15:9]

rust-analyzer: word-count (demo)1 errors1 warningsLn 1, Col 1UTF-8Rust

Try it: edit the code, type counts. or words. for completions, fix the red error with Quick fix, then press Run.

Frequently asked questions

Do these demos run real Rust?

No. They are simulations that show how each part of Rust Studio looks and behaves. The installed IDE builds real projects with the Rust toolchain on your PC.

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Who makes Rust Studio?

Rust Studio is a product of FOWLGUARD, the company behind Fowlguard Secure and Fowlguard Productivity. It is one of its free tools; see fowlguard.com.

Which systems does Rust Studio run on?

Windows 10 and 11 (64-bit), macOS and Linux (x86-64, X11 or Wayland). You can build for the desktop, the web and Android from it. iOS builds need a Mac with Xcode.

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Try every part of Rust Studio, right here

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The Rust IDE for web, mobile and desktop apps

Download Rust Studio

Rust web development, front end included