'Become a Better Developer by Learning Functional Programming in JavaScript' javascript webdevelopment
This post will tell you the basics and benefits of functional programming and how to use them in JavaScript.Functional programming is a way of writing software with specific principles. The idea is that these principles willImprove developer productivityFunctions should be pure.
Pure functions always produce the same output and have no side effects affecting the output. Side effects are anything that's outside the control of the function. e.g., any input/output such as reading from a database/file or using// This function is pure because it's determinisic. // It has no side effects. // Nothing outside the function can influence the output. // addTen will _always_ be 15 const addTen=input=>{ return input + 10; }; // Fetch the number from the database const numberFromDb=DB.getNumber; // This function is not pure because it's not deterministic. // It has a side effect . // We cannot know for sure that the outcome will be the same // every time we call it, and that's why it's not pure const addWithNumberFromDb=input=>{ return input + numberFromDb; };An application without I/O is not that useful. Functional programming is not about eliminating I/O. Instead, you should separate the business logic from I/O. Any side effects should be handled at the edges of our processes, and not in the middle of them. By doing this you achieve pure business logic that is easily testable. JavaScript is not a purely functional programming language. So there's nothing from stopping you doing whatever you feel comfortable with though. , on the other hand, is an example of a purely functional programming language. In Haskell, you're forced to use functional programming principles.An immutable state means that the state should not change. Instead of changing the state, in functional programming we. This might seem counter-intuitive: why would we want to copy the state instead of changing it?// Create a person with a name let simon={"name": "simon"}; // Instead of copying simon, we assign it by reference. // This is dangerous and can have unwanted behavior later. let lisa=simon; // Set the correct name of lisa lisa.name="lisa"; // But now we also updated simon's name! console.log; // { name: 'lisa' } // If we would have copied simon, this would not have happened // Let's see how we would do it in functional programming let beth={"name": "beth"}; // Copy beth instead of using a reference to it let andy={...beth}; // Set the correct name of andy andy.name="andy"; // Now both variables have the correct name console.log; // { name: 'andy' } console.log; // { name: 'beth' }
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