Maximum Nesting Depth of the Parentheses

export function maxDepth(s: string): number {
  let answer = 0;
  let currentDepth = 0;
  for (const char of s) {
    if (char !== '(' && char !== ')') continue;
    if (char === '(') {
      currentDepth += 1;
    } else {
      currentDepth -= 1;
    }
    answer = Math.max(answer, currentDepth);
  }
  return answer;
}