Question

How to find the number of occurrences (frequency) of each character in a string with JavaScript

Answer 1

function character_occurrences(s) { 
    const TOTLAASCII = 256; 
    let arr = new Array(TOTLAASCII).fill(0);
   
    const len = s.length; 
    for (let i = 0; i < len; i++) {
        arr[s[i].charCodeAt(0)]++; 
    }
 
    for (let i = 1; i < TOTLAASCII; i++) { 
        if (arr[i] > 0) {
            console.log(String.fromCharCode(i) + " - " + arr[i]);
        }
    } 
} 
       
const s = "javascriptc++phpcpythonc#"; 
           
character_occurrences(s); 
  
  
  
     
     
/*
run:
     
"# - 1"
"+ - 2"
"a - 2"
"c - 4"
"h - 2"
"i - 1"
"j - 1"
"n - 1"
"o - 1"
"p - 4"
"r - 1"
"s - 1"
"t - 2"
"v - 1"
"y - 1"
     
*/

 

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