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The predicate to filter recipes on cuisines (e.g., Italian recipes) 

applyFilter('cuisine', Value, RecipeIDsIn, RecipeIDsOut) :-

• The input Value, in this case, is a string Value, and to make sure it compares to what is in the database we need to make sure it is all lowercase. You can do this with ‘downcase_atom’.

Predicate to filter recipes that meet the dietary restrictions (such as ‘vegetarian’).

applyFilter('dietaryrestriction', Value, RecipeIDsIn, RecipeIDsOut) :-

• Use the function above you defined in your goal and This rule should filter recipes based on their membership to dietary restriction. To check if a recipe is a member of a dietary restriction you can use the built-in Prolog member/2 predicate.

• (member(Recipe, List of Recipes), diet(Recipe, List of Recipes in Diet))

Predicate to filter recipes on the max amount of time

applyFilter('duration', Minutes, RecipeIDsIn, RecipeIDsOut) :-

• Your condition/goal will ideally have three components, one of which is member/2

Predicate to filter easy recipes

applyFilter('easykeyword', _, RecipeIDsIn, RecipeIDsOut) :-

• You made a rule for this!

Predicate to filter recipes on the exclusion of a specific ingredient 

applyFilter('excludeingredient', Ingredient, RecipeIDsIn, RecipeIDsOut) :-

• There is a predicate in ingredient_hierarchies.pl which one could consider useful

Predicate to filter recipes on the exclusion of a specific ingredient type (for example: ‘beef’)

applyFilter('excludeingredienttype', Ingredient, RecipeIDsIn, RecipeIDsOut) :-

• The body of this rule is similar to the ‘exclude ingredient’ rule (the difference between ingredient and ingredient type is catered for in ingredient_hierarchy.pl)

Predicates to filter recipes on a specific ingredient inclusion

applyFilter('ingredient', Ingredient, RecipeIDsIn, RecipeIDsOut) :-

• Do your best!

Predicate to filter by including an ingredient type 

applyFilter('ingredienttype', Ingredient, RecipeIDsIn, RecipeIDsOut) :-

• The body is the same as the ingredient rule above

Predicate to filter recipes on meal type (for example: breakfast)

applyFilter('mealType', Value, RecipeIDsIn, RecipeIDsOut) :-

• Downcase_atom the Value input for compatibility 

Predicate to filter recipes on a maximum number of ingredients

applyFilter('nrOfIngredients', Value, RecipeIDsIn, RecipeIDsOut) :-

• Value inputs are an atom/string, check utils.pl

Predicate to filter recipes on a maximum number of steps

applyFilter('nrSteps', Value, RecipeIDsIn, RecipeIDsOut) :-

• Do your best!

Predicate to filter recipes and return fast recipes. A recipe is fast if it takes less than 30 minutes 

applyFilter('shorttimekeyword', _, RecipeIDsIn, RecipeIDsOut) :-

• Do your best!

Predicate to filter on the number of servings 

applyFilter('servings', Value, RecipeIDsIn, RecipeIDsOut) :-

• Do your best!

Predicate to filter recipes on a tag (for example: pizza) 

applyFilter('tag', Value, RecipeIDsIn, RecipeIDsOut) :-

• tag(RecipeID, Value) could be useful in your goal