javascript fold reduce functional programming

In JavaScript, reduce() is a higher-order function used for accumulating or “folding” values in an array, similar to the fold operation in functional programming. It applies a callback function to each element, accumulating a result. The syntax is:

• accumulator: The accumulated value across iterations.
• currentValue: The current element being processed.
• initialValue: The initial value for the accumulator.

Example: Summing numbers in an array:

This is an essential tool for functional programming in JavaScript.