Playing with Folktale

gistfile1.txt

const Either = folktale.result;
const Maybe = folktale.maybe;
const {task} = folktale.concurrency;

const fetchResult = (value) => {
  if (typeof value !== 'number'){
     throw 'not a number!'
  } else {
    return value
  }
};

const getAttempt = (input) => Either.try(() => fetchResult(input));

const result = getAttempt(2)
                .toMaybe()
                .map(x => x * 4)
                .map(x => x - 2)
                 .fold(e => console.warn('not yay'),
                       r =>  Maybe.of(r)
                            .map(x => x * 10)
                            .getOrElse('error'))

console.log('result: ', result);