String to Integer Atoi

var myAtoi = function(s) {
  const ans = [];
  let negation = 1;
  let sign = '';
  let unacceptedChars = false;
  let stopReading = false

  s.split('').forEach(el => {
    if(!Number.isInteger(parseInt(el)) && el !== ' ' && el !== '+' && el !== '-' && !ans.length) {
      unacceptedChars = true
    }
    if(sign.length && !Number.isInteger(parseInt(el))) {
      stopReading = true
    }
    if((!Number.isInteger(parseInt(el)) && ans.length)) {
      stopReading = true;
    }
    if(stopReading || unacceptedChars) return
    if(el === '+' || el === '-') {
      sign += el;
      if(el === '-') {
        negation = -1
      }
      if(!ans.length && sign.length > 1) {
        unacceptedChars = true;
      }
    }
    if(el === '.') {
      stopReading = true
    }
    if(Number.isInteger(parseInt(el)) && !stopReading) {
      ans.push(el)
    }
  })
  if(unacceptedChars) {
    return 0
  }
  const result = negation * ans.join('');

  if(result > (Math.pow(2,31) - 1)) {
    return (Math.pow(2,31) - 1)
  } else if(result < -1 * Math.pow(2,31)) {
    return -1 * Math.pow(2,31)
  }

  return result
};

function notEqual(arr) {
  let isEqual = true;
  arr.forEach(el => {
    if(el !== arr[0]) isEqual = false
  })
  return isEqual
}