remove brackets

// Andrey solution
//function test(s) {
//  let depth = 0
//  for (let char of s) {
//      if (char === '(') depth++
//    if (char === ')') depth--
//    if (depth < 0) return false
//  }
//  return depth === 0
//}

function test(s) {
var str = s;

while (str.includes("(") && str.includes(")") && str.indexOf("(") < str.indexOf(")")  ) {
str = str.replace("(", "");
str = str.split("").reverse().join("");
str = str.replace(")", "");
str = str.split("").reverse().join("");

}

return !(str.includes("(") || str.includes(")"))
}



alert(test('()')) // true
alert(test(')('))
alert(test('(')) // false
alert(test('qwe(qwrtqer(tqertqe)rtqertqet)qwer'))// true
alert(test('__)__(__(___)___)__')) // false