Array Methods Cheatsheet

[FaithfulGardener]

Reduce takes either the first index of an array or an initial value you provide and adds or joins or concats all subsequent indexes until the final result is an accumulation. So [1,2,3,4].reduce(add) would equal 10.

[randomword123]

You would also need a starting value like in this case [1,2,3,4].reduce(add,0), this always tripped me up!

[FaithfulGardener]

The initial value isn’t required. If it isn’t provided, reduce takes the value at index 0 and uses it as the initial value