Question

How to create an ASCII frequency table from a string in Rust

Answer 1

use std::collections::HashMap;

fn get_ascii_frequency(s: &str) -> HashMap<char, usize> {
    let mut frequency_table = HashMap::new();
    
    for ch in s.chars() {
        *frequency_table.entry(ch).or_insert(0) += 1;
    }
    
    frequency_table
}

fn main() {
    let s = "rust java c c++ c#";
    
    let frequency_table = get_ascii_frequency(s);
    
    println!("{:?}", frequency_table);
}

     
     
/*
run:
 
{' ': 4, 'u': 1, 's': 1, 'r': 1, 't': 1, 'c': 3, '+': 2, 'v': 1, 'j': 1, '#': 1, 'a': 2}

*/

 

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