Passing multiple parameters

ruby-talk
1

Hi,

  I have a method & i wanna pass around 25 parameters to it and i hav to
make string from that, as follows...

def method1(email, b_day, b_month, b_year, gender, f_name, l_name,
mdl_name, title, country, .......)

    params =
"email=#{email}&birth_day=#{b_day}&birth_year=#{b_year}.............."

end

it looks very odd when passing these many parameters. Is there any other
option that I can mention only mandatory args in the method & remaining
all are in single argument or something like that?

thanks in advance,
avantec

···

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2

Hi,

I have a method & i wanna pass around 25 parameters to it and i hav to
make string from that, as follows...

I wouldn't recommend writing a method that takes 25 parameters, but moving along...

def method1(email, b_day, b_month, b_year, gender, f_name, l_name,
mdl_name, title, country, .......)

   params =
"email=#{email}&birth_day=#{b_day}&birth_year=#{b_year}.............."

end

it looks very odd when passing these many parameters. Is there any other
option that I can mention only mandatory args in the method & remaining
all are in single argument or something like that?

Yes, you can do this:

def method1(required, required, required, *args)

Which Ruby will fill *args with remaining arguments as an array (empty array if there are none):

def test(a,b,*args)
  p a,b,args
end

=> nil

test(1,2,3,4,5)

1
2
[3, 4, 5]

Another option is to pass either an object in, or a Hash. I'd recommend this path if the data you're dealing with relates to each other (which it looks like it does).

Regards,
Chris White
http://www.twitter.com/cwgem

···

On Aug 10, 2011, at 8:10 AM, Avantec Van wrote:

3

Use options hash.

  def method1(options)
    email = options[:email]
    b_day = options[:b_day]
    ...

···

On Aug 10, 11:10 am, Avantec Van <abhil...@srishtisoft.com> wrote:

Hi,

I have a method & i wanna pass around 25 parameters to it and i hav to
make string from that, as follows...

def method1(email, b_day, b_month, b_year, gender, f_name, l_name,
mdl_name, title, country, .......)

params =

"email=#{email}&birth_day=#{b_day}&birth_year=#{b_year}.............."

end

it looks very odd when passing these many parameters. Is there any other
option that I can mention only mandatory args in the method & remaining
all are in single argument or something like that?

4

Another option is to pass either >an object in, or a Hash. I'd >recommend

this path if the data >you're dealing with relates to >each other (which it
looks like it >does).

+1
Read about a code smell named Primitive Obsession. If the set of params are
part of a higher level concept of your program, such as UserContact or
something similar, you should create an object for that. It can be a full
fledged class or a struct, for example.

Jesus.

5

Thomas Sawyer wrote in post #1015985:

Use options hash.

  def method1(options)
    email = options[:email]
    b_day = options[:b_day]
    ...

And note there is special syntax available when calling a method like
this: if the last argument is a hash, you don't need to wrap it in
{braces}

  method1 :email=>"president@whitehouse.gov", :b_day=>"1900/01/01"

If you're writing ruby 1.9 code (and you don't care about 1.8
compatibility), and all your keys are symbols, there's another syntax:

  method1 email: "president@whitehouse.gov", b_day: "1900/01/01"

···

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