The ins and outs of JavaScript reducer — a simple, yet powerful array method

JavaScript’s reduce is one of the most useful array methods that should be in a developer’s arsenal. 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. The reduce method executes a callback function that we provide on each element stored in an array and outputs the final value the operation generates. It’s a cleaner way of iterating over and processing the data stored in an array. Currently, it’s supported by all of the major browser versions, and is available in Node.js from version 10.0 upwards.…

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