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Ruby Ruby Blocks Blocks Practice Build a Monster Class: Part 4

Posted by Shoko Ishigaki
Shoko Ishigaki
21,826 Points

yield and block.call

I watched all the videos in this course and checked relevant questions, but I'm still not sure the difference between use of yield and block.call

yield self if block_given?
block.call(self)

Can someone help me understand the difference between these codes? Thanks in advance!

1 Answer

Jay McGavren
STAFF
Jay McGavren
Treehouse Teacher
Jay McGavren
Jay McGavren
Treehouse Teacher

There basically is no difference, except that yield implicitly calls the block without you having to store it in a variable first. So these are mostly equivalent:

def implicit_block
  puts yield
end

def explicit_block(&block)
  puts block.call
end

implicit_block { 3 } # Prints "3"
explicit_block { 4 } # Prints "4"

But, to me, the implicit_block style seems a little more convenient in this case.