Clarification to Split, join, reduce

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Hi guys… i am being honest here i have basic understanding of the filter, sort, reduce, join, split and concat methods… I need a firm understanding for my own sake and i am hoping i will get any one can help with resourceful contents…
Please note i have gone through with the Mozilla Developers site and W3schools… still going through them to understand when it get to complex situations…

3

Thanks @camperextraordinaire i will surely do so … God bless you for the help.

5

Thanks a lot, i really appreciate your help… God bless you i will go through to understand better…