check brackets js

const round = ["(", ")"];
const square = ["[", "]"];
const curly = ["{", "}"];

const left = [round[0], square[0], curly[0]];
const right = [round[1], square[1], curly[1]];

const isLeft = (char) => {
	return left.includes(char)
}

const isRight = (char) => {
	return right.includes(char)
}

const isSameType = (char1, char2) => {
	return round.includes(char1) && round.includes(char2) ||
  			square.includes(char1) && square.includes(char2) ||
        curly.includes(char1) && curly.includes(char2)
}

const checkBrackets = (str) => {
	const arr = Array.from(str);
  
  let toReturn = false;

	arr.forEach((char, index) => {
  	const prev = (str[index - 1]) ? str[index - 1] : null;
    
    //console.log(prev, char, isLeft(prev), isRight(char), isSameType(char, prev))
    
    if (isLeft(prev) && isRight(char) && !isSameType(prev, char)) {
    	//console.log("!!!!!!!!!!!!")
    	toReturn = true;
      return false;
    }
    
  });
  
  if (toReturn) return false;
  
  const leftCount = arr.filter((char) => isLeft(char)).length;
  const rightCount = arr.filter((char) => isRight(char)).length;

  
  return (leftCount === rightCount);
}

console.clear()

console.log(isLeft("("), isLeft("{"), isLeft("["), isLeft(")"))

const true_1 = "{[()]}";
const true_2 = "()[{}]()";
const true_3 = "{}[]()";
const false_1 = "[){}(]"
const false_2 = "())"
const false_3 = "[{)]"

/* console.log(isSameType("(", ")"));
console.log(isSameType("(", "("));
console.log(isSameType("}", ")")); */


console.log(checkBrackets(true_1))
console.log(checkBrackets(true_2))
console.log(checkBrackets(true_3))
console.log(checkBrackets(false_1))
console.log(checkBrackets(false_2))
console.log(checkBrackets(false_3))