I have an array s of Tiles with an instance variable @type:
class Tile
Types = ["l", "w", "r"]
def initialize(type)
@type = type
end
end
s = []
20.times { s << Tile.new(Tile::Types.sample)}
How do I get each Tile's @type? How do I return only the objects with a particular @type?
If you want to get an array containing each type attribute, you'll first need to create at least a reader for @type:
class Tile
attr_reader :type
Types = ["l", "w", "r"]
def initialize(type)
@type = type
end
end
Then use Array#map :
type_attribute_array = s.map(&:type)
#or, in longer form
type_attribute_array = s.map{|t| t.type)
If you want to filter Tile object according to their @type value, Array#select is your friend :
filtered_type_array = s.select{|t| t.type == 'some_value'}
Here's the doc for Array : Ruby Array
you can override to_s in your Tile class, return type from it and just iterate over your array s to print type by invoking <tile_object>.to_s
class Tile
Types = ["l", "w", "r"]
def initialize(type)
@type = type
end
def to_s
@type
end
end
s = []
20.times { s << Tile.new(Tile::Types.sample)}
s.each {|tile| puts tile.to_s}
