import _ from "lodash"
import R from "ramda"

function Doubler(activity: string) {
  this.activity = activity;
}

Doubler.prototype.map = function(f) {
  this.activity = `${f(this.activity)} ${f(this.activity)}`
  return this
}

function sayLoud(arg: string) { return _.upperCase(arg) }

const iceCreamEater = new Doubler("Eating ice cream");

console.log(sayLoud("something"));

console.log(R.map(sayLoud, iceCreamEater))