You are given a string s. Your task is to remove all digits by doing this operation repeatedly: Delete the first digit and the closest non-digit character to its left. Return the resulting string after removing all digits.

clearDigits.js

/**
 * @param {string} s
 * @return {string}
 */
var clearDigits = function(s) {
    while (true) {
        let digitIndex = -1;

        // Find the first digit in the string
        for (let i = 0; i < s.length; i++) {
            if (/\d/.test(s[i])) { // Check if the character is a digit
                digitIndex = i;
                break;
            }
        }

        // If no digit found, exit the loop
        if (digitIndex === -1) {
            break;
        }

        let nonDigitIndex = -1;

        // Find the closest non-digit character to the left of the digit
        for (let i = digitIndex - 1; i >= 0; i--) {
            if (/\D/.test(s[i])) { // Check if the character is not a digit
                nonDigitIndex = i;
                break;
            }
        }

        // Remove both characters
        if (nonDigitIndex !== -1) {
            // Construct the new string without the non-digit character and the digit
            s = s.slice(0, nonDigitIndex) + s.slice(nonDigitIndex + 1, digitIndex) + s.slice(digitIndex + 1);
        } else {
            // If there's no non-digit character to the left, just remove the digit
            s = s.slice(0, digitIndex) + s.slice(digitIndex + 1);
        }
    }

    return s;
};