match.js

/*! https://codeburst.io/alternative-to-javascripts-switch-statement-with-a-functional-twist-3f572787ba1c */
const match = x => {
  const matched = y => ({
    on: () => matched(y),
    otherwise: () => y
  })

  return ({
    on: (pred, fn) => (pred(x) ? matched(fn(x)) : match(x)),
    otherwise: fn => fn(x)
  })
}