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Start your free trialRob Munoz
Courses Plus Student 586 PointsPass Blocks as Args
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.
class SimpleBenchmarker
def run(description, &block)
start_time = Time.now
block.call
end_time = Time.now
elapsed = end_time - start_time
puts "\n#{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)
3 Answers
Salman Akram
Courses Plus Student 40,065 PointsHi Rob,
You will find two arguments inside def run
on second line, you may notice.
First is description and second is &block
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.
#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
Please remember, don't add any extra codes and just follow the questions in order to pass the exercise.
Hope that helps. ;)
krilnon
1,458 PointsHi 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:
benchmarker.run "Any description" do
# anything here is inside your new block
end
Rob Munoz
Courses Plus Student 586 PointsThanks so much, that was really helpful.
Rob Munoz
Courses Plus Student 586 PointsAwesome, 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.