The spread operator ..., introduced first in ES6 became one of the most popular and favourite feature among the developers.
A separate RFC was made for this much widely accepted feature to extend its functionalities to objects, prior it only worked on arrays.
This tutorial describes how to add element to the ending of an array using spread operator in ES6
Example with animals emoji
let animals = ["🦁", "🐵", "🐕", "🦊", "🐯"];
console.log(animals);
// Output → ["🦁", "🐵", "🐕", "🦊", "🐯"]
console.log(animals.length);
// Output → 5
animals = [...animals, "🦄"];
console.log(animals.length);
// Output → 6
console.log(animals);
// Output → ["🦁", "🐵", "🐕", "🦊", "🐯", "🦄"]
// now with multiple elements
animals = [...animals, "🐆", "🦓", "🐼", "🦘"];
console.log(animals.length);
// Output → 10
console.log(animals);
// Output → ["🦁", "🐵", "🐕", "🦊", "🐯", "🦄", "🐆", "🦓", "🐼", "🦘"]Happy coding