Meal Planner

data.js

module.exports = [
  {
    _key: 'MEXICAN_TACOS',
    _id: 'recipes/MEXICAN_TACOS',
    _rev: '_XTqNHIW--_',
    name: 'MEXICAN TACOS',
    Calories: 150,
    Fat: 5,
    Carbs: 1,
    Protein: 23,
    type: 'Meal',
    servings: 4,
  },
  {
    _key: 'CHOCOLATE_CHIP_FROZEN_YOGURT_ICE_CREAM',
    _id: 'recipes/CHOCOLATE_CHIP_FROZEN_YOGURT_ICE_CREAM',
    _rev: '_XTqNfbK--_',
    name: 'CHOCOLATE CHIP FROZEN YOGURT ICE CREAM',
    Calories: 519,
    Protein: 10,
    Carbs: 86,
    Fat: 17,
    type: 'Snack',
    servings: 1,
  },
];

meal-planner.js

const { List } = require('immutable');

const data = require('./data');

// find the combinations of recipes that amount total calories and protein requirements

const BODY_WEIGHT_LBS = 180;

const TOTAL_CALORIES = 3200;
const CALORIES_LOWER_BOUND = TOTAL_CALORIES - 50;
const CALORIES_UPPER_BOUND = TOTAL_CALORIES + 50;
const PROTEIN_UPPER_BOUND = 1 * BODY_WEIGHT_LBS;

function calculateDayMenu({
  menu = List([]),
  recipes = List([]),
  recipeIndex = 0,
  calories = 0,
  protein = 0,
}) {
  const shouldExit = recipeIndex >= recipes.size;
  if (shouldExit) {
    const shouldRestart = calories < CALORIES_LOWER_BOUND;
    if (shouldRestart) {
      return calculateDayMenu({
        recipes: List(data.sort(randomSort)),
      });
    }
    return { menu, calories, protein };
  }

  const recipe = recipes.get(recipeIndex) || {};
  const caloriesCounted = calories + recipe.Calories;
  const proteinCounted = protein + recipe.Protein;
  const remainingServings = recipe.servings - 1;

  const shouldSkipRecipe =
    caloriesCounted > CALORIES_UPPER_BOUND ||
    proteinCounted > PROTEIN_UPPER_BOUND ||
    recipe.servings === 0;

  if (shouldSkipRecipe) {
    return calculateDayMenu({
      menu,
      recipes,
      recipeIndex: recipeIndex + 1,
      calories,
      protein,
    });
  }

  const newMenuItem = `${recipe.Calories}cal | protein ${recipe.Protein}g | ${
    recipe.name
  } | ${recipe.type}`;

  const recipeUpdated = { ...recipe, servings: remainingServings };

  return calculateDayMenu({
    menu: menu.push(newMenuItem),
    recipes: recipes.update(recipeIndex, () => recipeUpdated),
    recipeIndex,
    calories: caloriesCounted,
    protein: proteinCounted,
  });
}

function randomSort() {
  if (Math.random() > 0.5) return 1;
  if (Math.random() > 0.5) return -1;
  return 0;
}

const dayMenu = calculateDayMenu({
  recipes: List(data.sort(randomSort)),
});

console.log(JSON.stringify(dayMenu, null, 4));

meal-planner.md

Meal Planner

Script in Javascript to automate meal planning in order to hit daily calories and protein.