JavaScript is really suitable for function programming because of functions being first class. Functions being first class means that JavaScript treats them as a type of object.
Arrays are usually used to store a list of elements that need to be accessed by a single variable. I believe that to use JavaScript effectively every developer should be able to use any one of these methods on an array. These methods can save a lot of lines of codes and also allow us to do some pretty awesome function programming!
In functional programming, being able to reduce is one of the fundamental concepts. Reduce is used to iterate through the values in…