Ruby: Proc.new { 'waffles' } vs. proc { 'waffles' }

Question

In Ruby, are there any differences between Proc.new { 'waffles' } and proc { 'waffles' }? I have found very few mentions of the second syntax.

From testing using irb, I haven't found any obvious differences. Is the second syntactic sugar for the first?

Prajna · Accepted Answer · 2012-07-12T09:18:48.543

51

From Metaprogamming Ruby Page 113.

In Ruby 1.8, Kernel#proc() is actually a synonym for Kernel#lambda(). Because of loud protest from programmers, Ruby 1.9 made proc() a synonym for Proc.new() instead.

edited Jul 12 '12 at 09:18

answered Jan 17 '11 at 06:33

Prajna

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Glorious. I'm using 1.9, so in my case, there are no differences. – ClosureCowboy Jan 17 '11 at 06:37
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See also: http://books.google.ca/books?id=jcUbTcr5XWwC&pg=PA194&lpg=PA194&dq=ruby+proc+synonym&source=bl&ots=fHJltd8taE&sig=pHkE5W-c9iHHHHfacmuPzeYuI48&hl=en&ei=fuMzTanHDo2usAPyqLTgBQ&sa=X&oi=book_result&ct=result&resnum=6&ved=0CDUQ6AEwBQ#v=onepage&q=ruby%20proc%20synonym&f=false – Zabba Jan 17 '11 at 06:37

Ruby: Proc.new { 'waffles' } vs. proc { 'waffles' }

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