From: Ryan Davis <ryand-ruby@...>
Date: 2012-06-14T13:32:07+09:00
Subject: Re: Calling methods, getting string and adding them


On Jun 13, 2012, at 21:28 , Ryan Davis wrote:

> 
> On Jun 13, 2012, at 21:24 , Paul Sutton wrote:
> 
>> Easiest is subjective - but yes, I think string interpolation is in
>> general a better solution when outputting a string.
> 
> It is measurable by the number of methods called and the number of garbage objects created.

Compare:

% ruby -rtracer -e '"a" + 1.to_s + "b" + 2.to_s + "c"'
#0:-e:1::-: "a" + 1.to_s + "b" + 2.to_s + "c"
#0:-e:1:Fixnum:>: "a" + 1.to_s + "b" + 2.to_s + "c"
#0:-e:1:Fixnum:<: "a" + 1.to_s + "b" + 2.to_s + "c"
#0:-e:1:String:>: "a" + 1.to_s + "b" + 2.to_s + "c"
#0:-e:1:String:<: "a" + 1.to_s + "b" + 2.to_s + "c"
#0:-e:1:String:>: "a" + 1.to_s + "b" + 2.to_s + "c"
#0:-e:1:String:<: "a" + 1.to_s + "b" + 2.to_s + "c"
#0:-e:1:Fixnum:>: "a" + 1.to_s + "b" + 2.to_s + "c"
#0:-e:1:Fixnum:<: "a" + 1.to_s + "b" + 2.to_s + "c"
#0:-e:1:String:>: "a" + 1.to_s + "b" + 2.to_s + "c"
#0:-e:1:String:<: "a" + 1.to_s + "b" + 2.to_s + "c"
#0:-e:1:String:>: "a" + 1.to_s + "b" + 2.to_s + "c"
#0:-e:1:String:<: "a" + 1.to_s + "b" + 2.to_s + "c"

2111 % ruby -rtracer -e '"a#{1}b#{2}c"'
#0:-e:1::-: "a#{1}b#{2}c"
#0:-e:1:Fixnum:>: "a#{1}b#{2}c"
#0:-e:1:Fixnum:<: "a#{1}b#{2}c"
#0:-e:1:Fixnum:>: "a#{1}b#{2}c"
#0:-e:1:Fixnum:<: "a#{1}b#{2}c"