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"]var arrays = [
["$6"],
["$12"],
["$25"],
["$25"],
["$18"],
["$22"],
["$10"]
];
var merged = [].concat.apply([], arrays);
console.log(merged);//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 ];