Ruby when nil or empty string

Question

I have RoR app, and I want to change some lines of my code to be more elegant.

foo = params[:customer][:language].nil? or params[:customer][:language].empty? ? 'es' : params[:customer][:language]

I try with

foo = params[:customer][:language] || 'es'

But it's not the same exactly.

Thanks in advance.

What about blank? method?

zrl3dx
– zrl3dx

2013-09-26 11:01:40 +00:00
Commented Sep 26, 2013 at 11:01 — zrl3dx
– zrl3dx, Commented Sep 26, 2013 at 11:01
api.rubyonrails.org/classes/Object.html#method-i-blank-3F

Yevgeniy Anfilofyev
– Yevgeniy Anfilofyev

2013-09-26 11:02:58 +00:00
Commented Sep 26, 2013 at 11:02 — Yevgeniy Anfilofyev
– Yevgeniy Anfilofyev, Commented Sep 26, 2013 at 11:02

Marek Lipka · Accepted Answer · 2013-09-26 11:14:30Z

7

You can use activesupport's Object#presence method, like this:

foo = params[:customer][:language].presence || 'es'

edited Sep 26, 2013 at 11:14

answered Sep 26, 2013 at 11:02

Marek Lipka

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1 Comment

Nikita Chernov Over a year ago

#presence is very useful. Especially if you have to chain multiple ors like: city.presence || country.presence || planet.presence. This line will return first non-nil or non-"" result.

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