الفرق بين slice و splice في المصفوفات

const items = [10, 20, 30, 40];
console.log(JSON.stringify(items.slice(1, 3)));
console.log(JSON.stringify(items));

[20,30]
[10,20,30,40]

const items = [10, 20, 30];
const removed = items.splice(1, 1, 99);
console.log(JSON.stringify(items));
console.log(JSON.stringify(removed));

[10,99,30]
[20]