Pass Blocks as Args

Question

Hi, 
I'm struggling to complete this exercise. I was wondering if anybody could elaborate on how I might pass either M or J as an argument.
```simplebenchmarker.rb
class SimpleBenchmarker
  def run(description, &block)
    starttime = Time.now
    block.call
    endtime = Time.now
    elapsed = endtime - start_time
puts "
#{description} results"
puts "Elapsed time: #{elapsed} seconds"
  end
end
benchmarker = SimpleBenchmarker.new 
def M
  puts "abcd"
end
J = [1,2,3,4,5].each {|x| puts x}
benchmarker.run ("a string", J)
```

Salman Akram · Accepted Answer

Hi Rob, 
You will find two arguments inside def run on second line, you may notice.   
First is description and second is &block
ruby
  def run(description, &block)

Call the run method on the benchmarker object and pass it two arguments. The first argument should be a string of the description. The second argument can be a block with any code you choose.
```ruby
First argument should have "string of description"
benchmarker.run "Any description you want" do
Second argument should have anything in block
  10.times do
    puts "any code you choose"
  end
end
```
Here's fully explanation, let's look at 5:14 (https://teamtreehouse.com/library/ruby-blocks/working-with-blocks/build-a-simple-benchmarker)
Please remember, don't add any extra codes and just follow the questions in order to pass the exercise.
Hope that helps. ;)

krilnon · Answer

Hi Rob,
In your code, neither M or J are blocks. M is a method, and J is an array which was generated with the help of a block. 
As it turns out, blocks cannot be stored directly in variables, so you will need to directly include a block along with your call to the run method.  The syntax for that, as noted by Salmon, is:
ruby
benchmarker.run "Any description" do
 # anything here is inside your new block
end

Rob Munoz · Answer

Awesome, thanks so much to the both of you. I still don't quite understand the methodology or syntax of passing a block but I made my own example and it worked. I guess I'm a sucker for parentheses. Some of the visual structure is lost when you don't delimit a second argument by a comma or contain it within a parentheses.

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Rob Munoz

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Pass Blocks as Args

3 Answers

Salman Akram

Salman Akram

krilnon

krilnon

Rob Munoz

Rob Munoz

Rob Munoz

Rob Munoz