I'm just wondering if using parentheses in Ruby makes a program slower. I know it's common to omit them, but for me, using parentheses increases readability.
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"makes program slower" - No, that'd be silly. – Sergio Tulentsev Mar 08 '18 at 09:46
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1Also follow [ruby style guide](https://github.com/bbatsov/ruby-style-guide) for references. There are some conventions where parentheses are not used. – Ashik Salman Mar 08 '18 at 09:52
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1You should write code for humans, not for machines. If parentheses increase readability, use them. – Stefan Mar 08 '18 at 09:55
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What happened when you measured it? – Jörg W Mittag Mar 08 '18 at 18:26
2 Answers
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Most of the time spent while running a ruby program is spent executing the code after parsing has been done. Whether you include parentheses or not affects the tokenization/parsing phase, which is a minor part of the total execution time. Even if there were any difference, it should be negligible.
sawa
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There is no difference if your are using parenthesis while calling method or not.
So these lines mean exactly the same:
puts "Hello!"
puts("Hello!")
There are some standard rules which you can follow
Use parentheses for all method calls that take arguments, except for the methods puts and p (and later: require and include).
If a method does not take any arguments, then do not add empty parentheses, omit them.
Sergio Tulentsev
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Sujay Gavhane
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1The OP knows that your two expressions are equivalent. The OP is not asking about that. – sawa Mar 08 '18 at 11:04