Question

How to count the frequency of the digits (0 to 9) in a string with TypeScript

Answer 1

function countDigits(s: string) {
    const size: number = s.length;
    
    if (size == 0) {
        console.log("String is empry");
        return;
    }
    
    let digit_frequency: number[] = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
    
    for (let i: number = 0; i < size; i++) {
        if (s.charAt(i) >= '0' && s.charAt(i) <= '9') {
            digit_frequency[s.charAt(i).charCodeAt(0) - '0'.charCodeAt(0)]++;
        }
    }
    
    for (let j: number = 0; j < 10; j++) {
        console.log(j + ": " + digit_frequency[j] + " times");
    }
}

const s = "c23c++4523typescript0923988rust82215";

countDigits(s);





/*
run:

"0: 1 times" 
"1: 1 times" 
"2: 5 times" 
"3: 3 times" 
"4: 1 times" 
"5: 2 times" 
"6: 0 times" 
"7: 0 times" 
"8: 3 times" 
"9: 2 times" 

*/

 

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