37 lines
939 B
Ruby
37 lines
939 B
Ruby
def person_is_seller?(name)
|
|
name[-1] == "m"
|
|
end
|
|
|
|
@graph = {}
|
|
|
|
# %w(string1 string2 ...) is a shorter way to define arrays of strings
|
|
@graph["you"] = %w(alice bob claire)
|
|
@graph["bob"] = %w(anuj peggy)
|
|
@graph["alice"] = %w(peggy)
|
|
@graph["claire"] = %w(thom jonny)
|
|
@graph["anuj"] = []
|
|
@graph["peggy"] = []
|
|
@graph["thom"] = []
|
|
@graph["jonny"] = []
|
|
|
|
def search(name)
|
|
search_queue = []
|
|
search_queue += @graph[name]
|
|
# This array is how you keep track of which people you've searched before.
|
|
searched = []
|
|
|
|
until search_queue.empty?
|
|
person = search_queue.shift
|
|
# Only search this person if you haven't already searched them.
|
|
next if searched.member?(person)
|
|
return person if yield person
|
|
search_queue += @graph[person]
|
|
# Marks this person as searched
|
|
searched.push(person)
|
|
end
|
|
|
|
false
|
|
end
|
|
|
|
search("you"){|person| person_is_seller?(person) }.tap{|person| puts "#{person} is a mango seller!" if person}
|