Stack-ParanthesisMatching.js

class Stack {
  constructor() {
    this.data = [];
  }

  push(val) {
    this.data.push(val);
    console.log(this.data) 
  }
  
  pop() {
    if (this.data.length == 0) return 'Underflow';
    return this.data.pop();
  }

  peek() {
    return this.data[this.data.length - 1];
  }
  
  isEmpty(){
    return (this.data.length>0)?true:false
  }
}

function bracketSelector(word, openingIndex) {
  const stack = new Stack();
  let endingIndex = openingIndex;
  for (let i = openingIndex; i < word.length; i++) {
    if (word[i] === '(') stack.push(word[i]);
    else if (word[i] === ')') {
      if (stack.peek() === '(') {
        stack.pop();
        endingIndex = i;
      }
    }
  }
  return endingIndex;
}

let word = 'Some ( and okay()) oijo';
let openingIndex = 5;
console.log(bracketSelector(word, openingIndex));