Comments on: How A Ruby Case Statement Works And What You Can Do With It

By: Suresh Nambiar

Suresh Nambiar — Sun, 24 Apr 2011 14:42:04 +0000

Slightly modified version…
Provides a function to convert a dateString to date.

def server_format_date ( strdate )
strdt = strdate.chomp.strip
case strdt.gsub(/\D/,”-”)
when /\d{8}/ then Date.strptime(strdt, “%d%m%Y”)
when /\d{7}/ then Date.strptime(’0′ + strdt, “%d%m%Y”)
when /\d{6}/ then Date.strptime(strdt, “%d%m%y”)
when /\d{5}/ then Date.strptime(’0′ + strdt, “%d%m%y”)
when /\d{4}/ then Date.strptime(strdt[0] + “-” + strdt[1] + “-” + strdt[2..3], “%d-%m-%y”)
when /\d{2}-\d{2}-\d{4}/ then Date.strptime(strdt, “%d-%m-%Y”)
when /\d{2}-\d{2}-\d{2}/ then Date.strptime(strdt, “%d-%m-%y”)
when /\d{4}-\d{2}-\d{2}/ then Date.strptime(strdt, “%Y-%m-%d”)
end
end

Test Cases :-

server_format_date ( ’2011-3-4′ )
server_format_date ( ’2011-3-04′ )
server_format_date ( ’2011-03-4′ )
server_format_date ( ’2011-03-04′ )

server_format_date ( ’4-3-2011′ )
server_format_date ( ’04-3-2011′ )
server_format_date ( ’4-03-2011′ )
server_format_date ( ’04-03-2011′ )

server_format_date ( ’4311′ )
server_format_date ( ’40311′ )
server_format_date ( ’040311′ )

server_format_date ( ’4032011′ )
server_format_date ( ’04032011′ )

By: Suresh Nambiar

Suresh Nambiar — Sun, 24 Apr 2011 14:39:46 +0000

def server_format_date ( strdate )
strdt = strdate.chomp
case strdt.gsub(/\D/,”-”)
when /\d{8}/ then Date.strptime(strdt, “%d%m%Y”)
when /\d{7}/ then Date.strptime(’0′ + strdt, “%d%m%Y”)
when /\d{6}/ then Date.strptime(strdt, “%d%m%y”)
when /\d{5}/ then Date.strptime(’0′ + strdt, “%d%m%y”)
when /\d{4}/ then Date.strptime(strdt[0] + “-” + strdt[1] + “-” + strdt[2..3], “%d-%m-%y”)
when /\d{2}-\d{2}-\d{4}/ then Date.strptime(strdt, “%d-%m-%Y”)
when /\d{2}-\d{2}-\d{2}/ then Date.strptime(strdt, “%d-%m-%y”)
when /\d{4}-\d{2}-\d{2}/ then Date.strptime(strdt, “%Y-%m-%d”)
end
end

Test Cases :-

server_format_date ( ’2011-3-4′ )
server_format_date ( ’2011-3-04′ )
server_format_date ( ’2011-03-4′ )
server_format_date ( ’2011-03-04′ )

server_format_date ( ’4-3-2011′ )
server_format_date ( ’04-3-2011′ )
server_format_date ( ’4-03-2011′ )
server_format_date ( ’04-03-2011′ )

server_format_date ( ’4311′ )
server_format_date ( ’40311′ )
server_format_date ( ’040311′ )

server_format_date ( ’4032011′ )
server_format_date ( ’04032011′ )

By: Chris

Chris — Sat, 12 Mar 2011 03:56:21 +0000

Thanks, dude! From problem to solution within 30 seconds of the google. Thanks!

By: Mitch

Mitch — Mon, 13 Dec 2010 19:48:10 +0000

Of course, this means that the case statement is linear in time rather that constant as it would be in other languages. That’s the original point of case statements, after all.

By: given/when – the Perl switch statement « transfixed but not dead!

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[...] post was inspired by this nice & straightforward blog article: How A Ruby Case Statement Works And What You Can Do With It. I’ve simply converted the Ruby code to Perl and added some so called insightful [...]

By: Akhil Bansal

Akhil Bansal — Mon, 19 Apr 2010 10:34:27 +0000

Interesting, I didn’t knew it.

By: smeally

smeally — Tue, 05 Jan 2010 00:06:32 +0000

Hey there this is a great post

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[...] How A Ruby Case Statement Works And What You Can Do With It [...]

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