* @param {string} s
 * @return {boolean}
 */
var isValid = function(s) {
    
	// created mapping of available bracket types
     const map = {
        '{': '}',
        '(': ')',
        '[': ']'
    }
	// checking if length is even, if not it is a fail from the start and no need to go further
    if(s.length%2 !== 0){
        return false;
    }
	// creating a buffer stack to push and pop items from 
    let balanceStack = [];
	
	//looping over the str
    for (let i = 0; i < s.length; i++) {
		// this basicaly unredable version of if(s[i] === '{' || s[i] === '(' ... so on )
		// am just getting all the keys from map object in an array and checking if and only if the char is an opening brace
        if(Object.keys(map).includes(s[i])) {
			// pushing the opening bracket in the stack
            balanceStack.push(s[i]);
        } else {
			// if it's a closing bracket then popping the opening bracket off of stack and tracking it with lastPopped
            let lastPopped = balanceStack.pop();
			
			// lastPopped should be a complement of closing bracket that is the current item and using map to determine that  
            if(map[lastPopped] !== s[i]){
                return false;
            }
        }
    }
	// at last checking if balanceStack array still have few items left then return false else we are good to go
    return (balanceStack.length>0)?false:true;  
       
};