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Generators are an odd part of the JavaScript language. And some people find them a bit of a puzzle. You might be a successful developer for decades and never feel the need to reach for them. Which raises the question, if you can go so long without ever needing them, what are they good for? Generators have a funny syntax, too. They have these strange starred function definitions; you can’t define t

Functional JavaScript: How to use array reduce for more than just numbers Reduce is the Swiss-army knife of array iterators. It’s really powerful. So powerful, you can build most of the other array iterator methods with it, like .map(), .filter() and .flatMap(). And in this article we’ll look at some more amazing things you can do with it. But, if you’re new to array iterator methods, .reduce() ca

How to deal with dirty side effects in your pure functional JavaScript So, you’ve begun to dabble in functional programming. Once you’ve started, it won’t be long before you come across pure functions. And, as you go on, you will discover that functional programmers appear to be obsessed with them. “Pure functions let you reason about your code,” they say. “Pure functions are less likely to start

Faster, Better, Cheaper—The art of making software Nobody wants to deliver late, over-budget software. I don’t know a single software developer who wakes up in the morning and thinks “I’d like to do a rubbish job today. How can I cost my employer more money?” And yet, so many software projects don’t go well. And with every new project, there seems to be more and more pressure to go faster. So, if

A Gentle Introduction to Functional JavaScript: Part 1 This is part one of a threefour-part series introducing ‘functional’ programming in JavaScript. In this article we take a look at the building blocks that make JavaScript a ‘functional’ language, and examine why that might be useful. Part 1: Building blocks and motivation, Part 2: Working with Arrays and Lists Part 3: Functions for making func