According to a quick benchmark on my machine (MacBook Air 2013, Ruby
2.1.0p0), using double quotes is about 2% faster:
require 'benchmark'
n = 10_000_000
Benchmark.bm do |x|
x.report { n.times do ; a = "1"; end }
x.report { n.times do ; a = '1'; end }
end
user system total real
1.020000 0.000000 1.020000 ( 1.015903)
0.990000 0.000000 0.990000 ( 0.992175)
However, as you can see it takes about 1 second to do 10 million
iterations, so in reality, using a " instead of a ' adds on about 2
nanoseconds on a 99 nanosecond operation. There are much bigger
inefficiencies in all of our code than worrying about saving the odd 2ns
here and there...
I personally tend to use double quotes everywhere, for the same reason that
I never do if statements on multiple lines (in Javascript for example)
without braces. I'd much rather have the almost unmeasurable wastage than
risk a bug.
Cheers,
Andy
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