—
function modifySimple(val) {
val += 1;
}
function modifyObject(obj) {
obj.prop = 'Hello';
}
let val = 2;
modifySimple(val);
console.log(val);
// still 2
let obj = {};
modifyObject(obj);
console.log(obj);
// now: { prop: 'Hello' }
Message permanent page