This is a basic calculator function. It only does addition, subtraction, multiplication, division and parentheses.

I'm having an infinite loop on recursive call in while section which is checking the string whether has a parentheses or not. If i would've send a string with 2 or more parentheses to the function, it has been stucking in loop. I couldn't figure out what I have done wrong.

const operators = ['+', '-', '*', '/', '(', ')'];
const numbers = [];
let arr;
const array = [];
function Calculate(string) {
  string.split('').map(char => {
    if (!operators.includes(char)) {
      numbers.push(char);
    } else {
      arr = numbers.join('');
      numbers.splice(0);
      array.push(arr, char);
    }
  });
  arr = numbers.join('');
  const str = array.filter(char => char !== '').concat(arr);

  while (str.includes('(')) {  // Checking parentheses
    let indexOpen = str.findIndex(char => char === '(');
    let indexClose = indexOpen + 1;
    let count = 1;

    while (count !== 0) {
      if (str[indexClose] === '(') {
        count++;
      } else if (str[indexClose] === ')') {
        count--;
      }
      indexClose++;
    }

    if (
      !operators.includes(str[indexOpen - 1])
      // str[indexOpen - 1] !== '+' &&
      // str[indexOpen - 1] !== '-' &&
      // str[indexOpen - 1] !== '*' &&
      // str[indexOpen - 1] !== '/'
    ) {
      str.splice(indexOpen, 0, '*');
      indexOpen++;
      indexClose++;
    }

    const strPara = str
      .filter((_, i) => i < indexClose - 1 && i > indexOpen)
      .join('');
    str.splice(indexOpen, indexClose - indexOpen, Calculate(strPara));
  }

  let indexMul;  // Multiplication and division
  let indexDiv;
  while (str.includes('*') || str.includes('/')) {
    indexMul =
      str.findIndex(char => char === '*') === -1
        ? str.length
        : str.findIndex(char => char === '*');
    indexDiv =
      str.findIndex(char => char === '/') === -1
        ? str.length
        : str.findIndex(char => char === '/');
    if (indexMul < indexDiv) {
      str.splice(indexMul - 1, 3, +str[indexMul - 1] * +str[indexMul + 1] + '');
    } else if (indexDiv < indexMul) {
      str.splice(
        indexDiv - 1,
        3,
        Math.trunc(+str[indexDiv - 1] / +str[indexDiv + 1]) + ''
      );
    }
  }

  while (str.length !== 1) { // Addition and subtraction
    if (str[1] === '+') {
      str.splice(0, 3, +str[0] + +str[2] + '');
    }
    if (str[1] === '-') {
      str.splice(0, 3, +str[0] - +str[2] + '');
    }
  }

  return str;
}

console.log(Calculate('3(16-(10-4)+2)/2(4*2)+1'));