how to select first value in array of arrays in js code example

Example 1: javascript select first n elements from array

const array = ['toto','tata','titi','tutu'];

array.slice(0, 2); // => ['toto','tata']

Example 2: javascript find first element of array

let array = ["a", "b", "c", "d", "e"];

// Both first1 and first2 have the same value.
let [first1] = array;
let first2 = array[0];