Объедините два массива JavaScript
let arr1 = [0, 1, 2];
let arr2 = [3, 5, 7];
let primes = arr1.concat(arr2);
// > [0, 1, 2, 3, 5, 7]
Arab Fire Shaman
let arr1 = [0, 1, 2];
let arr2 = [3, 5, 7];
let primes = arr1.concat(arr2);
// > [0, 1, 2, 3, 5, 7]/* Flatten (merge) an array of arrays with reduce & concat */
let myArrays = [[1, 2, 3], [4, 5], [6]];
myArrays.reduce((initial, current) => initial.concat(current), []);
// → [1, 2, 3, 4, 5, 6]
/* Join multiple arrays together. */
let warm = ["red", "orange"];
let cool = ["blue", "purple"];
let neutral = ["brown", "gray"];
let colors = warm.concat(cool).concat(neutral);
// → ["red", "orange", "blue", "purple", "brown", "gray"]const array1 = ["Vijendra","Singh"];
const array2 = ["Singh", "Shakya"];
const array3 = [...array1, ...array2];
// [ "Vijendra", "Singh", "Singh", "Shakya" ]//ES6 using the spread operator
const itemsA = [ 'Lightsaber', 'Mockingjay pin', 'Box of chocolates' ];
const itemsB = [ 'Ghost trap', 'The One Ring', 'DeLorean' ]
const allItems = [ ...itemsA, ...itemsB ];var array1 = ["Vijendra", "Singh"];
var array2 = ["Singh", "Shakya"];
console.log(array1.concat(array2));let arr1 = ['1', '2'];
let arr2 = ['3', '4'];
let combarr = [].concat(arr1); //define new variable, empty array then concatenating arr1 to it
combarr = combarr.concat(arr2); //combarr = itself, then concatenating arr2 to the end
console.log(combarr); //Expected output: ['1','2','3','4']