Array object fails to initialize as array in Ruby

Question

I'm trying to create a class Song that takes in two inputs, song and artist, and creates objects that are arrays i.e. [song, artist]. When I run this code, my assertion that my object is an array fails. How can I correctly write an initialize method that takes in two inputs and creates an array object?

My code:

class Song 
    def initialize(song, artist)
        @piece = [song, artist]
    end
end

hello = Song.new("hello", "goodbye")

def assert
    raise "Assertion failed!" unless yield
end

assert { hello.kind_of?(Array) }

falsetru · Accepted Answer · 2014-07-12 17:54:20Z

1

hello is a Song object, not an array object. Do you mean hello.piece ?

class Song 
    attr_reader :piece  # <---------

    def initialize(song, artist)
        @piece = [song, artist]
    end
end

hello = Song.new("hello", "goodbye")

def assert
    raise "Assertion failed!" unless yield
end

assert { hello.piece.kind_of?(Array) } # <------

answered Jul 12, 2014 at 17:54

falsetru

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1 Comment

user3832819 Over a year ago

Thanks, this passes! But I'm still not sure if my object is initializing correctly - I feel like this assertion should pass, but maybe I'm formatting it wrong too because it fails: assert {Song.new("hello", "goodbye") == ["hello", "goodbye"]}

Uri Agassi · Accepted Answer · 2014-07-12 18:03:55Z

1

your assertion assumes that hello is an array which is incorrect. hello is an instance of the class Song.

However, if you did added this to the top of your class:

attr_reader :piece

and then did this

assert { hello.piece.kind_of?(Array) }

that would pass.

edited Jul 12, 2014 at 18:03

Uri Agassi

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answered Jul 12, 2014 at 17:54

Anthony

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