This occurs as each iteration is hitting the else statement above. The following example uses Array.reduce() to sum the contents of an array of integers: const q4th = Ĭonst sum = q4th.reduce(function (accumulator, monthlySales) We’ll then compare it with the Syntax for reduce(). This article will explore both of these features of the reduce method.įirst, let’s take a look at a basic reduce() method example. You get to choose the data type to be returned.The Array object’s reduce method is an iteration method which, similar to other iteration methods ( map(), forEach(), filter() etc.) helps us work through all of the elements of a dataset, performing actions on each one.Īrray reduce has two very powerful features:
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