Ruby proc vs lambda in initialize()
- by Jimmy Chu
I found out this morning that proc.new works in a class initialize method, but not lambda. Concretely, I mean:
class TestClass
attr_reader :proc, :lambda
def initialize
@proc = Proc.new {puts "Hello from Proc"}
@lambda = lambda {puts "Hello from lambda"}
end
end
c = TestClass.new
c.proc.call
c.lambda.call
In the above case, the result will be:
Hello from Proc
test.rb:14:in `<main>': undefined method `call' for nil:NilClass (NoMethodError)
Why is that?
Thanks!
