[ruby-core:86158] [Ruby trunk Feature#14022] String#surround

Issue #14022 has been updated by sawa (Tsuyoshi Sawada).


I admit that now we can use `yield_self`. I didn't think interpolation was elegant enough, but I think I can live with the combination of `yield_self` and `%`.

```ruby
["foo", "bar"]
.join(", ")
.yield_self{|s| '<%s>' % s}
# => "<foo, bar>"
```

Please close the issue.

----------------------------------------
Feature #14022: String#surround
https://bugs.ruby-lang.org/issues/14022#change-71035

* Author: sawa (Tsuyoshi Sawada)
* Status: Feedback
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
After joining the elements of an array into a string using `Array#join`, I frequently need to put substrings before and after the string. In such case, I would have to use either of the following:

```ruby
[1, 2, 3].join(", ").prepend("<").concat(">") # => "<1, 2, 3>"
"<#{[1, 2, 3].join(", ")}>"                   # => "<1, 2, 3>"
"<" + [1, 2, 3].join(", ") + ">"              # => "<1, 2, 3>"
```

but none of them is concise enough. I wish there were `String#surround` that works like this:

```ruby
[1, 2, 3].join(", ").surround("<", ">") # => "<1, 2, 3>"
```



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