spread operator in javascript
// spread operators can be used for arrays or objects
// cloning to prevent mutation.
let numList = [1,2,3];
let numListClone = [...numList]; // [1, 2, 3]
// spread operator for destructuring.
let animal = {
name: 'dog',
color: 'brown',
age: 7
};
let { age, ...otherProperties } = animal;
// spread operator as rest operator
function sum(x, y, ...rest) {}
// spread operator for merging arrays or objects
let numLists = [...numList1, ...numList2];
let animalWithBreed = {
...animal,
breed: '',
}