JavaScript Array Tricks

Arrays are one of the most common data types in JavaScript. While there are many libraries that deal with them, here are some awesome tips and tricks you can leverage in your code without adding any external dependencies.

Unique values in array
Finds all unique values in an array.
JavaScript, Array · Oct 22, 2020
Compact array
Removes falsy values from an array.
JavaScript, Array · Oct 22, 2020
Truth check all values in a JavaScript array
Learn how to check if all values in an array are true or false.
JavaScript, Object · Nov 6, 2023
Array difference
Calculates the difference between two arrays, without filtering duplicate values.
JavaScript, Array · Oct 19, 2020
Array union
Returns every element that exists in any of the two arrays at least once.
JavaScript, Array · Oct 22, 2020
Array intersection
Returns the elements that exist in both arrays, filtering duplicate values.
JavaScript, Array · Oct 20, 2020
Find the head and tail of an array in JavaScript
Find the head or tail of a JavaScript array without mutating it.
JavaScript, Array · Oct 8, 2023
Last array element
Returns the last element in an array.
JavaScript, Array · Oct 20, 2020
Flatten array
Flattens an array up to the specified depth.
JavaScript, Array · Oct 22, 2020