JavaScript копировать массив
let arr =["a","b","c"];
// ES6 way
const copy = [...arr];
// older method
const copy = Array.from(arr);
Batman
let arr =["a","b","c"];
// ES6 way
const copy = [...arr];
// older method
const copy = Array.from(arr);const sheeps = ['Apple', 'Banana', 'Juice'];
// Old way
const cloneSheeps = sheeps.slice();
// ES6 way
const cloneSheepsES6 = [...sheeps];setMyArray(oldArray => [...oldArray, newElement]);
var numbers = [1,2,3,4,5];
var newNumbers = Object.assign([], numbers);var oldColors=["red","green","blue"];
var newColors = oldColors.slice(); //make a clone/copy of oldColors// this is for array with complex object
var countries = [
{name: 'USA', population: '300M'},
{name: 'China', population: '1.6B'}
];
var newCountries = JSON.parse(JSON.stringify(countries));