Keyword Arguments of Ruby makes code more clear

chenge Dec 26 '18 ・1 min read

#ruby #cleancode

In this video the speaker demoed the pros of KWArgs.

In the pic, upper code is obviously more clear.

So when should you use it? I think, when it's hard to identify the params you should use KWArgs.

The usage is simple:

def foo(bar:, baz:)
end


foo(bar: 1, baz: 2)

Do you think so?

Dec 27 '18

Didn't watch the video, but what I find interesting is that keyword arguments did not exist until Ruby 2.0, which means before Ruby 2.0, there's a totally different way to do hack it, and you'll sometimes see this in the wild :) (I've encountered this in Rails' DateTime library)


# Ruby 2.0
def method(first:, second:)
  puts "First: #{first}, Second: #{second}"
end

# Ruby 1.9
def method(options={})
  first = options.fetch(:first)
  second = options.fetch(:second)
  puts "First: #{first}, Second: #{second}"
end

robots.thoughtbot.com/ruby-2-keywo...

REPLY

Author

Dec 27 '18

Yes, it simplify code. Very useful.

REPLY

Dec 26 '18

Seems right as shown, but perhaps only for .new?

For any other method:

If the parameters are related, could they form a class and be passed as an object?
If not, does the method lack a unified purpose?

REPLY

Author

Dec 26 '18

Right, better params no more than 3. If more than 3 maybe should use hash or object.

REPLY

Dec 28 '18

How does it handle extra arguments? Does it ignore it or throw an exception?

REPLY

Author

Dec 28 '18

ArgumentError

REPLY

code of conduct - report abuse

Classic DEV Post from Oct 19 '18

Have you used the new "suggested changes" in GitHub pull requests?

These are pretty cool! "Suggested Changes" are in public beta and allow you to ...

Reactions

60

Reactions

13

NArray - Ruby equivalent of NumPy

kojix2 - Apr 25

OO Ruby Concepts Part 3, Object Relationships

Donna Amos - Apr 25

Guide to Deploying Your App to Heroku

Sofia Jonsson - Apr 24

Outputting Markdown from Jekyll using hooks

Nicholas C. Zakas - Apr 23

Ruby, and learn Rust, Go, Elixir, Erlang...

location

China

work_status

I'm looking for work!

joined

Sep 10, 2017

Do you prefer sans serif over serif?

You can change your font preferences in the "misc" section of your settings. ❤️