JavaScript(JS) JS merge two arrays and remove duplicate items

To merge two arrays and remove duplicate items in JavaScript/JS, you can use the concat() method to join the arrays, and then use a Set object to remove duplicate items. Here's an example:

const arr1 = [1, 2, 3];
const arr2 = [3, 4, 5];
const mergedArr = [...new Set(arr1.concat(arr2))];
console.log(mergedArr); // Output: [1, 2, 3, 4, 5]

In the above example, we first define two arrays arr1 and arr2. We then merge these two arrays using the concat() method and store the result in the mergedArr variable.

To remove the duplicate items, we create a new Set object from the merged array using the spread operator ..., which automatically separates each element of the array into individual items. We then convert the Set object back to an array using the Array.from() method or the spread operator ....

This creates a new array with only unique elements, which is stored in the mergedArr variable. Finally, we log the mergedArr variable to the console to verify that the operation was successful.