Cartoon Collections

Objectives

• Get familiar iterating through arrays with enumerator methods like .collect or .map, .find, and .include?.
• Build methods and control their return values.
• Practice control flow with if and else statements.

Instructions

There are four methods to complete in this lab:

1. roll_call_dwarves
2. summon_captain_planet
3. long_planeteer_calls
4. find_the_cheese

Method 1 — roll_call_dwarves

This method should accept an array of dwarf names, for instance:

["Doc", "Dopey", "Bashful", "Grumpy"]

It should then print out each name, in number order, using puts. The print-out should look like this:

1. Doc
2. Dopey
3. Bashful
4. Grumpy

Look into the each_with_index method.

Once the test for this method is passing, move on to the next method.

Method 2 — summon_captain_planet

This method should accept an array argument of planeteer calls that will look like this:

planeteer_calls = ["earth", "wind", "fire", "water", "heart"]

It should then capitalize each element and add an exclamation point at the end. The return value of this method should be an array, in this example:

summon_captain_planet(planeteer_calls)
#=> ["Earth!", "Wind!", "Fire!", "Water!", "Heart!"]

The .map or .collect method might be appropriate for this task, take a look at it here and here.

Once the test for this method is passing, move on to the next method, long planeteer calls.

Method 3 — long_planeteer_calls

The long_planeteer_calls method should accept an array of calls. The method should tell us if any of the calls are longer than four characters. For example:

short_words = ["puff", "go", "two"]
long_planeteer_calls(short_words)
#=> false

assorted_words = ["two", "go", "industrious", "bop"]
long_planeteer_calls(assorted_words)
#=> true

Notice the return value of this method is either true or false, depending on the array it was given as an argument.

Checkout the Ruby docs on arrays for a hint.

Once the test for this method is passing, move on to the last method.

Method 4 — find_the_cheese

The find_the_cheese method should accept an array of strings. It should then look through these strings to find and return the first string that is a type of cheese. The types of cheese that appear are "cheddar", "gouda", and "camembert".

For example:

snacks = ["crackers", "gouda", "thyme"]
find_the_cheese(snacks)
#=> "gouda"

soup = ["tomato soup", "cheddar", "oyster crackers", "gouda"]
find_the_cheese(soup)
#=> "cheddar"

If, sadly, a list of ingredients does not include cheese, return nil:

ingredients = ["garlic", "rosemary", "bread"]
find_the_cheese(ingredients)
#=> nil

You can assume that all strings will be lowercase. Take a look at the .include method for a hint. This method asks you to return a string value instead of printing it so keep that in mind.

Resources

• The .each_with_index method
• The .map method
• The .include method

View Cartoon Collections Lab on Learn.co and start learning to code for free.