12 - Mapping Filtering Reducing
These three functions are VERY useful. They allow you to do things to a whole list in one go.
Mapping does something (whatever you set it up to do) to every item in a list. It creates a new list altered in that way.
Filtering creates a new list which only includes thos items which meet the criteria that you specify.
Reducing takes a list and performs a function (such as add) on each item to create a single answer.
The code used in this video can be found via https://lyw4.life/Resources/scheme.php.