From: xtkoba+ruby@... Date: 2021-03-27T00:33:44+00:00 Subject: [ruby-core:103047] [Ruby master Misc#17751] Do these instructions (<<, +, [0..n]) modify the original string without creating copies? Issue #17751 has been updated by xtkoba (Tee KOBAYASHI). I would not even concatenate any strings and would `push` them to an array, as if they were immutable (like in Go language for example). If you really need to concatenate them and have to care about the speed and the memory efficiency, you can create a C extension and use `char[]` to manipulate them. ---------------------------------------- Misc #17751: Do these instructions (<<,+,[0..n]) modify the original string without creating copies? https://bugs.ruby-lang.org/issues/17751#change-91108 * Author: stiuna (Juan Gregorio) * Status: Open * 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: