Javascript arrays can contain duplicates - which is fine most of the time, but can sometimes cause some issues. For example, if an array is supposed to only contain unique user IDs, but is taken from ...

Use popular 'grammar of data' syntax to filter and subset your two-dimensional JavaScript arrays and more. Here's how to use Arquero for data wrangling in Observable JavaScript and Node.js. There are ...

This past February, Spotify was found to be hosting—and in some cases actively playlisting—an array of white supremacist music. Those findings, by the Anti-Defamation League’s Center on Extremism, ...

JavaScript’s reduce is one of the most useful array methods that should be in a developer’s arsenal. Introduced in ES5, it’s somewhat similar to for…each and map methods that are used with arrays, but ...

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’re ...

️ To complete this challenge: Write and test your code in the provided REPL.it links below (remember to click Save to save your work!), and copy the links to your solutions and paste them into a ...