3174.js

/** ------------------------------------------------------------------------------
 * 
 * 3174. Clear Digits
 * Topics: Stack
 * https://leetcode.com/problems/clear-digits/?envType=daily-question&envId=2025-02-10
 * 
 ------------------------------------------------------------------------------ */
/**
 * @param {string} s
 * @return {string}
 */
var clearDigits = function (s) {
  let stack = []

  for (const char of s) {
    if (!isNaN(+char)) {
      stack.pop()
    } else {
      stack.push(char)
    }
  }

  return stack.join("")
}

console.log(clearDigits("a1b2c3"))