const MY_CONSTANT = {myProperty: 6};
console.log(MY_CONSTANT.myProperty);
// 6


MY_CONSTANT.myProperty = 18;
console.log(MY_CONSTANT.myProperty);
// 18

const OTHER_CONSTANT = [12, 14, 16];
console.log(OTHER_CONSTANT[0]);
// 12

OTHER_CONSTANT[0] = 22;
console.log(OTHER_CONSTANT[0]);
// 22