Reduce method executes a callback function that we provide on each element stored in an array and outputs the final value the operation generates. Introduced in ES5, it’s somewhat similar to for…each and map methods that are used with arrays but improves on their performance and simplicity in specific situations.
Javascript reducer is one of the most useful array methods that should be in a developer’s arsenal. Using reduce() in place of filter().map().Grouping an array of objects by a property.Calculate the sum of values in an array.
