It is stable with 100% code coverage and is currently being used at HackerRank in Production. In Imperative Programming paradigm you manipulate the state of the program directly using statements to achieve the desired behavior. Your aim as a React developer is to write declarative code as much as you can. This article is part of the series “TLTR; React”. Learning how to write declarative code completely changed my mind about programming. “Programming Paradigm” sounds super pretentious and is definitely a phrase some of my college profs loved. If I have to give a precise definition, it would be: match-rules is a tiny (1kB GZipped) zero dependency JavaScript utility that lets you write your conditional business logic in a declarative way. Open source and radically transparent. We will see some real-life examples to help you recognize the difference with imperative. It’s like learning how to drive a supercar. I draw the line between declarative and non-declarative at whether you can trace the code as it runs. And I've had a tough week so make my day while doing it...", and she'd get it done! Sudhanshu Yadav for code review, design discussion, feedback, and coming up with the name match-rules :p In the case of 'or,' your rules will be compared with 'or' operator. Think of it more of a practice as it works on the principles we just discussed. That stuff is all done for us in React: we just tell React what the end result should be. Below is an example of this in modern JavaScript. This component can accept a weight to filter by, and displays the matching hog profile pictures in the browser. As you can see this approach is imperative: What if we could write our application like this: React went popular because it lets you work with the state of your UI and it abstracts all DOM updates in a fast and predictable way. Try this library. You can compose and pass multiple rules: compose/extend multiple rules to form new rules, which avoids repetition. My life would be much easier if I just tell you what to do instead of instructing you the steps above. Declarative programming is a programming paradigm … that expresses the logic of a computation without describing its control flow. Imagine for a second that we're hiring someone to paint our house: In an imperative world, we'd tell them to open the can of paint, dip their brush in it, and then move the brush in a stroking fashion along the wall. Explain the difference between declarative and imperative programming, Describe some of the trade-offs of declarative programming, Describe the benefits of declarative programming with respect to React, Explicitly describes the actions a program should take. Here’s the comparison between the two approaches: In the second approach we leverage the map() array method and thus we avoid looping over the array items. For the sake of simplicity we use the class .selected to indicate one selected day at a time. match-rules handle rule matching logic for you, so you don't have to write specs. : In the example above, we are saying: "When rendered, there should be a
element with elements for every item in our filteredHogsArray". I try to explain the core functionality of the React ecosystem in an easy-to-follow way. This object contains properties or methods that let your UI function inform you about certain events, for example a mouse click. React Router Components are the heart of React's powerful, declarative programming model. Declarative programming makes your code more concise, easier to read and reason about and reduces side effects. It can be used with feature flags, complex conditions, conditional rendering, and the rest is your imagination.