###An elegant way to chain methods in Ruby ##
Simply include Wendy in the class you want to chain methods in. You now have access to the wend method.
The wend method accepts as its argument the initial parameter for the chain.
You then 'wend' this argument through multiple methods by chaining them with the through and and methods.
When you're done, call result or and_return to get the final result.
Here's an example:
class MathsFunctions
include Wendy
def double(x)
x + x
end
def square(x)
x * x
end
def two_x_squared(x)
wend(x).through(:double).and(:square).and_return
end
end
MathsFunctions.new.two_x_squared(5) # => 100
You can also pass extra arguments to methods in the chain, like this:
def add(x, y)
x + y
end
def wend_with_arg(x)
wend(x).through(:square).and(:add, 15).result
end
NB. Methods called in the chain must be defined on the class on which wend is called.