Answer1215

摘要： A pointed functor is a functor with an of method What's important here is the ability to drop any value in our type and start mapping away. The benifi 阅读全文

摘要： We will see a peculiar example of a pure function. This function contained a side-effect, but we dubbed it pure by wrapping its action in another func 阅读全文

摘要： An introduction to concatting items via the formal Semi-group interface. Semi-groups are simply a type with a concat method that are associative. We d 阅读全文

摘要： It is really important to understand function signature in functional programming. The the code example below: 'map' is pointfree version of any founc 阅读全文

摘要： In the class version of this component, we had a method called safeSetState which would check whether the component was still mounted before trying to 阅读全文

摘要： Transducers are composable algorithmic transformations. They are independent from the context of their input and output sources and specify only the e 阅读全文

摘要： Thanks to react-testing-library our tests are free of implementation details, so when we refactor components to hooks we generally don't need to make 阅读全文

摘要： Maybe has two types: Just / Nothing. Just() will just return the value that passed in. Nothing returns nothing... Just/ Nothing are both functors, the 阅读全文

摘要： We refactor a function that uses try/catch to a single composed expression using Either. We then introduce the chain function to deal with nested Eith 阅读全文

摘要： We can get a lot of utility through CLI tools invoked via npm scripts. Many of these tools have APIs with many flags and options, meaning we will freq 阅读全文