fp vs. oop water bottle

fp-water-bottle.js

const bottle_size = 1000;
let bottle_fullness = 600;

function read_water_level(bottle_fullness) {
  console.log(bottle_fullness)
};

function drink_water(bottle_fullness, thrist_score) { // one unit of water quenches 1 thrist point
  let new_fullness = 0;
  let remaining_thirst = 0;
  //   let _new_fullness = 0; // for ES5 notation example
  //   let _remaining_thirst = 0;

  // fill this in
  
  return { new_fullness, remaining_thirst }; // es6 syntax: https://codeburst.io/es2015-quickie-enhanced-object-literals-ae0d41b60465
      // {new_fullness: _new_fullness, remaining_thirst: _remaining_thirst}; // ES5 notation example
      // PythonTutor - https://goo.gl/LzQ3P7
}

function fill_bottle(bottle_fullness, bottle_size, water_purchased) {
  let new_fullness = 0;
  let remaining_water = 0;
  
  // fill this in
  
  return {new_fullness, remaining_water};
}


// ----- day in the life -----

bottle_fullness = fill_bottle(bottle_fullness, bottle_size, 700).new_fullness;
// let fill_bottle_returned = fill_bottle(bottle_fullness, bottle_size, 700);
// bottle_fullness = fill_bottle_returned.new_fullness;

let thirst = 400;
let drink_water_returned = drink_water(bottle_fullness, 600);
thirst = drink_water_returned.remaining_thirst; // 1000
bottle_fullness = drink_water_returned.new_fullness; // 400

oop-water-bottle.js

let water_bottle = {
  capacity: 1000,
  fullness: 600,
  read_water_level: function() {
    console.log(this.fullness);
  },
  drunk_from: function(thirst_score) {
    let remaining_thirst = 0;
    // update this.fullness
    return remaining_thirst;
  },
  
}

// going off the deep end:
// if you wanted to include thirst in this program:
// let person = {
//   thirst: 300, 
//   drinks_from_bottle: function(a_water_bottle) {
//     a_water_bottle.drunk_from(300)
//     this.thirst -= 300 (or whatever was left in the bottle)
//   }
// }
// water_bottle.drink_water(person.get_thirst());

// let drinking_app = {
//   person: person,
//   water_bottle: water_bottle,
//   drink_from: function(a_number) {
//     //   subtract this from bottle, add it to person
//   }
// }

prompt

build two watter bottle applications:
  state: water in bottle
  user stories: 
    - drink water
    - add water
    - see how much is left