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Start your free trialMichael Kristensen
Full Stack JavaScript Techdegree Graduate 26,251 PointsCurly-Braces Vs. Do-End - One works, the other does not, but why?
Due to a bit of a habit working with curly-braces, I have gotten to the point where I use them instead of the Do-End structure Jason suggests for multi-line blocks, more or less experiencing them as synonymous in most situations, but then I ran in to the situation where:
class SimpleBenchmarker
def run(description, &block)
start_time = Time.now
block.call
end_time = Time.now
elapsed = end_time - start_time
puts "\n"
puts "#{description} results"
puts "Elapsed time: #{elapsed} seconds"
end
end
benchmarker = SimpleBenchmarker.new
benchmarker.run "Sleep a random amount of time" {
5.times {
print "."
sleep(rand(0.1..1.0))
}
}
does not work, with an error message of:
simple_benchmarker.rb:14: syntax error, unexpected '{', expecting end-of-input
...leep a random amount of time" {
...
but the following code block working just fine:
class SimpleBenchmarker
def run(description, &block)
start_time = Time.now
block.call
end_time = Time.now
elapsed = end_time - start_time
puts "\n"
puts "#{description} results"
puts "Elapsed time: #{elapsed} seconds"
end
end
benchmarker = SimpleBenchmarker.new
benchmarker.run "Sleep a random amount of time" do
5.times do
print "."
sleep(rand(0.1..1.0))
end
end
Does anyone know what the difference is here?
1 Answer
KRIS NIKOLAISEN
54,971 PointsAfter reading this stack overflow I added parentheses and the code ran with curly braces
benchmarker.run ("Sleep a random amount of time") {