From: nobu@... Date: 2021-03-28T04:15:59+00:00 Subject: [ruby-core:103068] [Ruby master Misc#17751] Do these instructions (<<, +, [0..n]) modify the original string without creating copies? Issue #17751 has been updated by nobu (Nobuyoshi Nakada). xtkoba (Tee KOBAYASHI) wrote in #note-6: > ```ruby > f.print data[:header] > data[:payload].each do |s| > f.print s > end > ``` `IO#print` accepts multiple arguments, so this code can be `f.print data[:header], *data[:payload]`. ---------------------------------------- Misc #17751: Do these instructions (<<,+,[0..n]) modify the original string without creating copies? https://bugs.ruby-lang.org/issues/17751#change-91129 * Author: stiuna (Juan Gregorio) * Status: Closed * Priority: Normal ---------------------------------------- In my program a string increases considerably in size inside a loop, at the end of that loop a header is created that will have to go to the beginning of that string. During the whole loop: ``` ruby str << "some data" ``` At the end: ``` ruby header = "other data" str = header + str ``` I understand that using (+) creates a copy to then modify the original variable, that is not desirable, I would like to do something similar to (<<), which I understand does not create copies. If I do this: ``` ruby header << str ``` I would have two variables with a very large size. I also have this other code and I don't know if it is an "in place" modifier: ``` ruby str = "12345" str[0..2] = "" #s => 45 ``` In short, I want to know what instructions I should use to remove a given range from a string and how to concatenate to both the beginning and end of the target string without having to create copies. -- https://bugs.ruby-lang.org/ Unsubscribe: