Question

I have a method that is given a particular options hash like this

def send_params(options = {})
 #Create string of some values in the hash.
end

I want to create a string with some of the values are in the hash. Particularly I am looking for the keys :key1, :key2, :key3, :key4 to create a string with their correspondent values. So, if my hash is like this:

{:key1 => 'value1', :key2 => 'value2', :key3 => 'value3', :key4 => 'value4', , :key5 => 'value5'}

I want to be able to create a string like:

'value1,value2|value3,value4' 

And have the remaining hash as:

{:key5 => 'value5'}

So, the values that are found should be deleted from the hash. What is a good way of doing so?

Answer 1

Hash#delete may be what you are looking for.
It will remove a key/value pair from a hash and return the value.

Example:

h = {
  :key1 => 'value1',
  :key2 => 'value2',
  :key3 => 'value3',
  :key4 => 'value4',
  :key5 => 'value5'
}
str = "#{h.delete :key1},#{h.delete :key2}|#{h.delete :key3},#{h.delete :key4}"
p str # => "value1,value2|value3,value4" 
p h   # => {:key5=>"value5"}