Question

How to create an ASCII frequency table from a string in Node.js

Answer 1

function getASCIIFrequency(str) {
    const frequencyTable = new Array(128).fill(0);

    for (let i = 0; i < str.length; i++) {
        frequencyTable[str.charCodeAt(i)]++;
    }

    return frequencyTable.reduce((accumulator, count, index) => {
        if (count > 0) {
            accumulator[String.fromCharCode(index)] = count;
        }
        return accumulator;
    }, {});
}

const str = "javascript c c++ c# java python php";

const asciiFrequency = getASCIIFrequency(str);

console.log(asciiFrequency);



/*
run:
  
{
  ' ': 6,
  '#': 1,
  '+': 2,
  a: 4,
  c: 4,
  h: 2,
  i: 1,
  j: 2,
  n: 1,
  o: 1,
  p: 4,
  r: 1,
  s: 1,
  t: 2,
  v: 2,
  y: 1
}
           
*/

 

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