JSFiddle - React, Tailwind, and code Playground

JavaScript

var Arr1 = new Array(1,2,3,4,5,6,7,8,9,10);

var Arr2 = Arr1;

alert(Arr2);
Arr2[4] = 1;
alert(Arr1);
alert(Arr2);

var Arr1 = new Array(1,2,3,4,5,6,7,8,9,10);

var Arr2 = Arr1.slice();

alert(Arr2);
Arr2[4] = 1;
alert(Arr1);
alert(Arr2);