In JavaScript - ECMAScript 2021, you can use the Array.prototype.slice() method to get the first and last element of an array.
To get the first element of an array, you can use the slice() method with an argument of 0 (which represents the starting index). To get the last element of an array, you can use the slice() method with an argument of -1 (which represents the last index).
Here are some examples:
// First element of an array
const myArray = [1, 2, 3, 4, 5];
const firstElement = myArray.slice(0, 1)[0];
console.log(firstElement); // Output: 1
// Last element of an array
const lastElement = myArray.slice(-1)[0];
console.log(lastElement); // Output: 5
Alternatively, you could also use array destructuring to access the first and last elements of an array:
// First and last elements of an array using array destructuring
const [first, ...middle, last] = myArray;
console.log(first); // Output: 1
console.log(last); // Output: 5