What is point free code?
Point free style means that the code doesn’t explicitly mention it’s arguments, even though they exist and are being used. This works in Haskell because of the way functions work. For instance: myTake = take.
Why point free style?
Point-free style is related to the way we invoke functions and can play nicely with curried functions. It helps us write code that is more concise and readable. As with a lot of techniques, it can of course be harmful when taken to the extreme.
What is point free style JavaScript?
What is Point Free. Point free style is basically you write code but don’t explicitly provide the arguments in the code. This is usefully especially in callbacks where a function is expected. I’ll show you the examples in TypeScript, it’ll work the same in JavaScript/ES6.
What is equational reasoning?
The kind of reasoning we will performing about our programs is called equational reasoning. In other words, we will be proving that one expression is equal to another. For example, we might want to prove that for any list l, l == reverse (reverse l)
What is composition in JavaScript?
A common composition pattern in JavaScript is using object composition. It combines the power of objects and functional programming. Then, you can define behaviors as functions receiving the self . That makes them easily composable since they’re just functions. Then we’ll use any object merging utility, such as Object.
Why does Haskell support equational reasoning?
In a purely functional language like Haskell you formally reason about your code within the language itself. This is why Haskell syntax for function definitions deviates from mainstream languages. All function definitions are just equalities, which is why Haskell is great for equational reasoning.
Is currying necessary?
Currying is essential for languages that lack data types and have only functions, such as the lambda calculus. While these languages aren’t useful for practical use, they’re very important from a theoretical point of view.