Question

Possible Duplicates:
Using do block vs brackets {}
What is the difference or value of these block coding styles in Ruby?

Why does:

test = [1, 1, 1].collect do |te|
    te + 10
end
puts test

Works, but not:

puts test = [1, 1, 1].collect do |te|
    te + 10
end

And yet this works:

puts test = [1, 1, 1].collect { |te|
    te + 10
}

Is there a difference between the do/end construct and the { } construct for blocks I am not aware of?

Answer 1

In the “not working” case, the block is actually attached to the puts call, not to the collect call. {} binds more tightly than do.

The explicit brackets below demonstrate the difference in the way Ruby interprets the above statements:

puts(test = [1, 1, 1].collect) do |te|
    te + 10
end

puts test = ([1, 1, 1].collect {|te|
    te + 10
})