![]() The job of the callback function is to keep adding the sum to the current element in the array. This method takes as argument a callback function, which is executed on every element of salaries array. ![]() Then we will loop over every element in salaries array using forEach() method. One way of doing so is to have a sum variable which is initialized to zero. Our goal is to calculate the sum of elements in this array. Today, in this video, we will learn what is reduce() higher order function in JavaScript arrays, why reduce is useful and how it works? Let's say we have an array of salary numbers stored inside a variable called salaries. 00:00 Hey, it's Deeksha Sharma from bonsaiilabs.
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