Question

I’m new to Ruby, how do I do something like this? in C#, I would have written

my_block().ToList() 

and it would work.

I’m imagining this function

def my_block
    yield 1
    yield 2
    yield 3
end

my_block.to_enum().map {|a| a}

This gives me this error:

test.rb:2:in `my_block': no block given (yield) (LocalJumpError)
    from test.rb:7:in `<main>'

What is the correct incantation for this behavior?

Answer 1

The correct syntax for your code is:

to_enum(:my_block).to_a # => [1,2,3]

Object#to_enum expects symbol with method name as its parameter:

to_enum(method = :each, *args)
enum_for(method = :each, *args)

Creates a new Enumerator which will enumerate by on calling method on obj.

Equivalent for C# ToList() is Enumerable#to_a

to_a → array
entries → array

Returns an array containing the items in enum.