Since the output will be an object, we will start with an empty object as our accumulator and then keep adding properties to it as we iterate over the input array. And we will be using the reduce function to iterate over the input array. We’ll go through the how-to and when-to guide of using the Javascript reducer in different scenarios. Here is what we already know: We will be taking an input array and a key as an input and returning an object as the output. Today, we are going to explore this reduce method. The reduce method takes in an array and returns a single value, which is what we want for our groupBy method. We will be making use of the array.reduce method for our implementation. The reduce() method reduces the given array into a single value by executing a reducer function. Now that we understand what groupBy does, let us get to implementing it.
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