Codility #7-Brackets

function solution(S) {

let stack = [];

for (let i = 0, n = S.length; i < n; i++) {

let c = S.charAt(i);

switch (c) {

case '{':

case '[':

case '(':

stack.push(c);

break;

case '}':

if (stack.pop() !== '{') return 0;

break;

case ']':

if (stack.pop() !== '[') return 0;

break;

case ')':

if (stack.pop() !== '(') return 0;

break;

}

}

return stack.length === 0 ? 1 : 0;

}