Question

How to count the occurrences of each letter in char array with TypeScript

Answer 1

function countLetterOccurrences(charArray: string[]): Record<string, number> {
    const letterCounts: Record<string, number> = {};

    charArray.forEach(char => {
        if (letterCounts[char]) {
            letterCounts[char]++;
        } else {
            letterCounts[char] = 1;
        }
    });

    return letterCounts;
}

const charArray: string[] = ['t', 'y', 't', 'c', 'd', 'c', 'e', 'f', 'e', 't'];

const result = countLetterOccurrences(charArray);

console.log(result);

 
    
/*
run:

{
  "t": 3,
  "y": 1,
  "c": 2,
  "d": 1,
  "e": 2,
  "f": 1
} 

*/
 
 

 

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