reduce() method is your trusty ally. This method takes a callback function with two parameters: the
accumulator (the accumulated value previously returned in the last invocation) and the
currentValue (the current element being processed).
Variations of this syntax allow for additional parameters, such as
array, but let's keep our focus on summing values for now.
Here's how to sum items in an array using
Filter out odd numbers first, then sum the evens:
Concatenate two arrays, then find their sum:
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