Learning JS: Higher Order functions
Quality study is always going to benefit from looking at multiple resources on the same topic. In self-directed study, not only do we have to read and work through the tutorial material, we have to seek it out for ourselves.
.filter .map .find .forEach .some .every .reduce and .includes in such a way that the examples draw out the subtleties.
.map .filter .reduce .sort with some dummy data. To work through this yourself, make sure you know how to construct an array and an object literal. It complements the previous video from Brad Schiff, skipping over some of the definitions and background explanations in favour of practise.