js массив добавить элемент
array.push(element)
Common Mynah
array.push(element)let array = ["A", "B"];
let variable = "what you want to add";
//Add the variable to the end of the array
array.push(variable);
//===========================
console.log(array);
//output =>
//["A", "B", "what you want to add"]const array1 = ['a', 'b', 'c'];
const array2 = ['d', 'e', 'f'];
const array3 = array1.concat(array2);var fruits = ["Orange", "Apple", "Mango"];
var moreFruits = ["Banana", "Lemon", "Kiwi"];
fruits.push(...moreFruits);
//fruits => ["Orange", "Apple", "Mango", "Banana", "Lemon", "Kiwi"]
/*The push() method adds elements to the end of an array, and unshift() adds
elements to the beginning.*/
let twentyThree = 'XXIII';
let romanNumerals = ['XXI', 'XXII'];
romanNumerals.push(twentyThree);
// now equals ['XIX', 'XX', 'XXI', 'XXII', 'XXIII']
romanNumerals.unshift('XIX', 'XX');
// now equals ['XIX', 'XX', 'XXI', 'XXII']
>>> a.push(...b)