Array.prototype.map() is a method that iterates over an array and applies a function to each element, modifying it in some way. The result is then returned as a new array, leaving the original array ...

The Array object has always had some oddities. Methods like sort, reverse, and splice change the array in place. Other methods like concat, map, and filter create a copy of the array and then operate ...

The map() method creates a new array populated with the results of the callback function for each element in the array. Similar to the other methods, the callback function will receive three ...

As developers, we find ourselves responsible for all sorts of common, but tedious, tasks, such as iterating over arrays. Although a for loop will work for these tasks, we can take advantage of a ...

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 ...

Learn how JavaScript’s built-in functions like map() and filter(), as well as compose() and chain(), support a more elegant handling of JavaScript arrays.