Spread

Spread and Rest Operators:

...

Spread:

Used to split up array elements OR object properties

const newArray = [...oldArray, 1, 2]

const newObject = { ...oldObject, newProp: 5}

Rest:

Used to merge a list of function arguments into an array

function sortArgs(...args) {
return args.sort()
}

const numbers = [1, 2, 3];

const newNumbers = [...numbers, 4];

console.log(newNumbers);

// [1,2,3,4]

// Without spread [[1,2,3],4]

For object:

const person = {
    name: ‘Max’
};

const newPerson = {
    ...person,
    age:28
}

console.log(newPerson);

const filter = (...args) => {

return args.filter( el => el === 1);

}

console.log(filter(1, 2, 3));