Full Screen
- 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
andelse
statements.
There are four methods to complete in this lab:
roll_call_dwarves
summon_captain_planet
long_planeteer_calls
find_the_cheese
This method should accept an array of dwarf names, for instance:
["Doc", "Dopey", "Bashful", "Grumpy"]
It should then print out each name using puts
. The print-out should look like this:
- Doc
- Dopey
- Bashful
- Grumpy
Look into the each_with_index
method.
Once the test for this method is passing, move on to the next method.
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.
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.
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.
- The
.each_with_index
method - The
.map
method - The
.include
method
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