WIP - Addresses joeldrapper#211

lib/literal/array.rb

@@ -293,6 +293,18 @@ def to_a
 
 	alias_method :to_ary, :to_a
 
+	def transpose
+		unless @__type__ == Array
+			raise ArgumentError.new("#transpose expects Array type")
+		end
+
+		if @__type__ == Array
+			__with__(@__value__.transpose)
+		elsif @__type__ == Literal::Array
+			# TODO: Implement transpose for Literal::Array
+		end
+	end
+
 	def unshift(value)
 		Literal.check(actual: value, expected: @__type__) do |c|
 			c.fill_receiver(receiver: self, method: "#unshift")

test/array.test.rb

@@ -201,3 +201,16 @@
 
 	expect { array.replace("not an array") }.to_raise(ArgumentError)
 end
+
+test "#transpose raises if type is not Array" do
+	array = Literal::Array(Integer).new(1, 2, 3)
+
+	expect { array.transpose }.to_raise(ArgumentError)
+end
+
+test "#transpose returns a new array with rows and columns transposed" do
+	array = Literal::Array(Array).new([1, 2], [3, 4], [5, 6])
+
+	transposed = array.transpose
+	expect(transposed.to_a) == [[1, 3, 5], [2, 4, 6]]
+end