Shortest way to convert a Hash into String

Question

there is a Hash like this:

params = { k1: :v1, k2: :v2, etc: :etc }

i need it converted to a string like this:

k1="v1", k2="v2", etc="etc"

i have a working version:

str = ""
params.each_pair { |k,v| str << "#{k}=\"#{v}\", " }

but it smells like ten PHP spirits ...

what's the Ruby way to do this?

yep, i know, but the output is quite different from what i need — James Evans
– James Evans, Commented Nov 1, 2012 at 7:11

user904990 · Accepted Answer · 2012-11-01 07:05:13Z

4

try this:

str = params.map {|p| '%s="%s"' % p }.join(', ')

see it in action here

answered Nov 1, 2012 at 7:05

user904990

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4 Comments

James Evans Over a year ago

splendid, how does it work? i feel my mind is seriously screwed by long PHP years... :( Djkastra was right - some languages does seriously damaging human minds

user904990 Over a year ago

@oldergod, sorry? you simply call params.map in your code and it should work

user904990 Over a year ago

@JamesEvans, you asking how does it work? simply. map block receives an array of key/val as first arg and we feed it to %, which is a shorthand for printf

Benoît Over a year ago

I did not know it was a shorthand for printf and that is what I was asking for. Thanks, great answer.

Aditya Kapoor · Accepted Answer · 2012-11-01 07:11:33Z

1

Try this...

hash.collect { |k,v| "#{k} = #{v}" }.join(" ,")

answered Nov 1, 2012 at 7:11

Aditya Kapoor

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3 Comments

James Evans Over a year ago

much better but i need value in double quotes

Aditya Kapoor Over a year ago

try this...hash.collect { |k,v| "#{k} = '#{v}' " }.join(" ,")...the compiler throws up backslashes when we try to change the order of double and single quotes...

Aditya Kapoor Over a year ago

hash.collect { |k,v| "#{k} = \"#{v}\"" }.join(" ,")...this is also an option but the o/p is "k1 = \"v1\" ,k2 = \"v2\" ,etc = \"etc\""

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