Issue #14022 has been updated by knu (Akinori MUSHA).


I thought `yield_self` was about solving problems like this:

`[1, 2, 3].join(", ").yield_self { |s| "<#{s}>" }`

A nice-to-have in addition would be a [shorter name](https://bugs.ruby-lang.org/issues/10095), a [special syntax](https://bugs.ruby-lang.org/issues/6684#note-2), or a default block parameter (`it`, `_`, or whatever).

----------------------------------------
Feature #14022: String#surround
https://bugs.ruby-lang.org/issues/14022#change-67388

* Author: sawa (Tsuyoshi Sawada)
* Status: Open
* 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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