====== Java Script Reduce function ======

;;;**reduce** is a method that applies a function against an accumulator and each element in the array (from left to right) to reduce it to a single value.;;; \\ \\ 

This can be very useful for tasks such as summing all the values in an array or reducing an array of objects into a more useful structure. \\ \\ 

Here's the general syntax:
<code javascript>
array.reduce(callback[, initialValue])
</code>

===== Callback =====

This is the function to execute on each element in the array, taking four arguments:
  * **accumulator**: The accumulated value previously returned in the last invocation of the callback.
  * **currentValue**: The current element being processed in the array.
  * **currentIndex**: (Optional) The index of the current element being processed.
  * **array**: (Optional) The array on which reduce was called.

===== Initial Value =====

**initialValue** - (Optional) Value to use as the first argument to the first call of the callback.