JSFiddle - React, Tailwind, and code Playground

by Vladymyr Shevchuk

JavaScript

const arr1 = [];

arr1[3] = 1;
arr1[5] = 1;

const arr2 = [];

arr2[8] = 2;
arr2[10] = 2;

/* console.log(arr1); */
/* console.log(arr2); */

const result1 = [...arr1, ...arr2];
const result2= arr1.concat(arr2);

/* result1.forEach(item => {
  console.log('result1 item', item);
}); */

result2.forEach(item => {
  console.log('result2 item', item);
});

console.log(result1);
console.log(result2);