Arrays are wonderful and a very particular type in JavaScript. There are many useful built-in properties and methods that will help you resolve any task which involves this kind of type. Today, we ...

Step 5. Create an array of unique values in a table column It can be useful to get one column’s unique values as a vanilla JavaScript array, for tasks such as populating an input dropdown list.

Additionally, the array will be re-indexed, meaning the hole will be closed and indexes re-numbered to become sequential again. So far, we’ve used a static index to delete a value…this doesn’t happen ...