kata_js_ValidParentheses.js

// https://www.codewars.com/kata/52774a314c2333f0a7000688/train/javascript

function validParentheses(parens) {
   var count =0;
   for (var i = 0; i < parens.length; i++) {
      if(parens.charAt(i) =="(") count++;
      if(parens.charAt(i) ==")") count--;
      if(count ==-1 )  return false;
    }
    if(count == 0 )  return true;
    return false;
  }

console.log(validParentheses("("),false);
console.log(validParentheses("(("),false);
console.log(validParentheses(")"),false);
console.log(validParentheses("()"),true);
console.log(validParentheses("())("),false);
console.log(validParentheses("())("),false);