Array reduce explained with examples javascript tutorial

to use `reduce()`, you can optionally provide an initial value for the accumulator. if not provided, the first element of the array is used as the initial accumulator, and iteration starts from the second element. this method is commonly employed for various tasks, such as summing numbers in an array, flattening nested arrays, or counting occurrences of items. its versatility makes it an essential tool for functional programming patterns in javascript, promoting cleaner and more expressive code. understanding how to effectively use `reduce()` can significantly enhance your programming skills.
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