Recover from a Nothing with the "alt" method (Crocks, Ramda libraries)

crocks.js

const crocks = require('crocks');

const { and, compose, isEmpty, isString, Maybe, not, prop, safe } = crocks;
const { join, split, toLower } = require('ramda');

const isNonEmptyString = and(not(isEmpty), isString);
const createUrlSlug = compose(join('-'), split(' '), toLower);

const createUrl = slug => `localhost:3000/${slug}`;

const article = {
	id: 1,
	name: 'Learn FP with this one weird trick'
};

const getArticleName = obj =>
	prop('name', obj)
		.chain(safe(isNonEmptyString))
		.alt(Maybe.of('Page Not Found'));

const url = getArticleName(article)
	.map(compose(createUrl, createUrlSlug));

console.log(url);

learn more about crocks and ramda