Maybe, Result and Pattern matching

Optional Data

import { Maybe } from 'funpro';

maybeNumber = Maybe.Just(42);

// returns a Just a price or Nothing if it isn't on sale
const maybe = item.getSalePrice();

const displaySale = matchWith(maybe, {
  Just: price => `${price} EUR`,
  Nothing: () => `not on sale`,
});

Danger Zone

Safe functions

Methods

• map
• chain
• of