Combine if and do in a single line?

rubyonrails-talk
1

items.each { |item| item.stuff? } if current_user.admin?

2

Jonathan Rochkind wrote: [...]

The {| | } and the 'do' syntaxes are interchangeable in all ways.

Almost. I've run across a couple of cases where one works and the other doesn't -- one creates a Proc and the other doesn't, or something like that. But that's vanishingly rare, and 99 times out of 100, you will not go wrong to treat them as interchangeable.

More of a Ruby question than a Rails one.

Yup.

Best,

3

Jonathan Rochkind wrote:

[...]

> The {| | } and the 'do' syntaxes are interchangeable in all ways.

Almost. I've run across a couple of cases where one works and the other doesn't -- one creates a Proc and the other doesn't, or something like that.

{} binds more tightly than do..end - in some cases this can lead to your block being passed to the 'wrong' method:

def foo(x)   puts "foo #{block_given?}" end

def bar   puts "bar #{block_given?}" end

running foo bar {} outputs

bar true foo false

but running

foo bar do end

outputs

boo false foo true

Fred