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assignment.rb
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assignment.rb
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class Assignment
attr_accessor :keys, :values
def initialize(key="", value="")
if key != "" and value != "" then
@keys = [key]
@values = [value]
else
@keys = []
@values = []
end
end
#push function to add new assigment
def push(key, value)
if @keys.include?(key) then
return "Your desired key is already used!"
elsif !self == value then
@keys.push(key)
@values.push(value)
else
return "Invalid input!"
end
end
#onedirectional search
def search(key)
if @keys.include?(key) then
return @values[@keys.index(key)]
else
return nil
end
end
#check existence of key in assingment
def includes?(key)
if @keys.include?(key) then
return true
else
return false
end
end
def size()
return @keys.length
end
def index(key)
if @keys.include?(key) then
return @keys.index(key)
else
return "No such key in this assignment!"
end
end
#delete function, only delition over the key name possible
def delete(key)
if @keys.include?(key) then
@values.delete_at(@keys.index(key))
@keys.delete(key)
else
return "No such key in this assignment!"
end
end
def merge(assignment)
if assignment.is_a? Assignment then
index = 0
indice = []
assignment.keys.each do |elem|
if !@keys.include?(elem) then
@keys.push(elem)
indice.push(index)
end
index+=1
end
indice.each do |ind|
@values.push(assignment.values[ind])
end
else
return "Can't merge #{assignment.class} with assignment!"
end
end
#simple inspect function returns object
def inspect()
return self
end
#further inspect methods
def values()
return @values
end
def keys()
return @keys
end
end