Set of useful first-class structures which allow you to get rid of your developer's pain.
- Flatten by default.
- Minimal API sufrace area.
- Immutable.
- Lazy evaluation.
- Full interoperability between all structures and JavaScript natives.
npm install dgelong
I don't want make another implementation that requires Ph.D in Math. The usage of monads should be as simple as functional composition f(g(a)). API should be close to native. So if we're talking about data structures, they should be produced in the same way as natives: by calling constructor function with or without new operator (I prefer the second approach).
import Dgelong from 'dgelong';Or just use something specific, for example:
import { Option, Either } from 'dgelong';import { Just, Nothing } from 'dgelong';
function square(n) {
return n * n;
}
function isEven(n) {
return n % 2 ? Nothing() : Just(n);
}
new Just(5)
.map(square) // returns Just(25)
.map(isEven) // returns Nothing()
.map(alert); // won't be executedimport { Success, Failure } from 'dgelong/either';
function validateUserPassword(password) {
if (password.length < 10) return Failure('Password is too short');
if (!/[0-9]/g.test(password)) return Failure('Password should contain numbers');
return Success(password);
}
validateUserPassword('boo')
.map(savePassword, showError);