Arrays are wonderful and a very particular type in JavaScript. There are many useful ... methods every developer should know. So, let’s get started: This list is not enumerated as I don ...

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. Arquero has several functions to accomplish this ...

// .filter(callback) returns a new array with all elements for which the callback returns true letters = ["a", "b", "b", "c", "a", "c", "d"]; var unique_letters ...

Concatenates two arrays, removing duplicates in the process and returns one array with unique values. * In case the elements in the ... (optional) supply an alternative way to get an element's ...