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Reading your blog allowed me to better understand the reduce function for the first time and I want to thank you for that.

For learning the concepts, something that I found rather enlightening was writing map/filter/every (and I guess, some or any, and really just about any function that operates on a collection), -with- a reduce.

Then, write your own recursive implementation of reduce.

I found it really helpful in grokking what these things did, and more broadly improved my understanding and use of functional composition

shameless plug, here is my article about ES5 array methods that looks at them in depth : https://medium.com/@sAbakumoff/a-deeper-dive-into-javascript...