FAQ: Blocks, Procs, and Lambdas - Try It Yourself!

This community-built FAQ covers the “Try It Yourself!” exercise from the lesson “Blocks, Procs, and Lambdas”.

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def double(param)

puts double(8) {|x| x * 2 }

It is a nice thing to be able to have lots of tools, but it makes me wonder, in which use-cases using these weird constructions would be preferable?


I found this discussion which makes the purpose of yield much clearer with only a slightly more complicated example. They really don’t do a good job of explaining why it’s useful.



I’m curious about its possible use scenarios too!