function isParenthesisMatched (str) {

    let stack = new Stack();

    let openingParenthesis = ["[", "(", "{"] ;
    let closingParenthesis = ["]", ")", "}"];

  for (let i = 0; i < str.length; i++) {
            if (openingParenthesis.includes(str[i])) {
                stack.push(str[i]);
            } else if (closingParenthesis.includes(str[i])) {
                switch (str[i]) {
                    case "]":
                        if (stack.peek() === "[") {
                            stack.pop();
                        } else {
                            return false;
                        }
                        break;

                        case "}":
                        if (stack.peek() === "{") {
                            stack.pop();
                        } else {
                            return false;
                        }
                        break;

                        case ")":
                        if (stack.peek() === "(") {
                            stack.pop();
                        } else {
                            return false;
                        }
                        break;
                }
            }
        }
        return stack.length() === 0;

  }

  console.log(isParenthesisMatched("{[()]}")); // retruns true
  console.log(isParenthesisMatched("{()}[]")); // returns true
  console.log(isParenthesisMatched("{[)]}")); // returns false