Curry in Ruby

While I was wandering around Proc and Lambda in Ruby, I found very useful method Proc#curry. This method answer the question that bugs me for a while, is there an easy way to make Curry happen in Ruby? Let look at the example how to use it.


Start with a simple method:

	def sum(x,y,z)
	x+y+z
	end
	puts sum(2,3,4)
	=> 9

view raw sum.rb hosted with ❤ by GitHub

Manually currying: 

	sum = -> x { -> y { -> z { x + y + z } } }
	puts sum[2][3][4]
	=> 9

view raw manual_sum.rb hosted with ❤ by GitHub

But with Proc#curry, you can heavily simplify your code like this:

	sum = ->x,y,z { x + y + z }.curry
	puts sum[2][3][4]
	=> 9

view raw curry_sum.rb hosted with ❤ by GitHub

Pretty neat!

Benefits of TDD

I just read a blog post about TDD and really like it, TDD for Those Who Don't Need It. It reminds me to my first impression when I start practicing TDD more than a year ago, it allows us to not have to to hold everything in our head.

By the way, that post also mentions to other TDD benefits. I want to note it down here just for a reference.

• Not have to hold everything on our head. Just follow errors.
• Confidence to refactor
• Better design
• Documentation
• Regression