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From: | Tino Calancha |
Subject: | Re: concat with separators ? |
Date: | Sun, 28 May 2017 20:27:05 +0900 (JST) |
User-agent: | Alpine 2.20 (DEB 67 2015-01-07) |
On Sun, 28 May 2017, Jean-Christophe Helary wrote:
I wouldn't worry too much about `string-join' not being in the manual. It's going to keep there. If it's convenient for you feel free to use it.On May 28, 2017, at 19:52, Tino Calancha <address@hidden> wrote:That's roughly the definition of string-join in subr-x: (defsubst string-join (strings &optional separator) "Join all STRINGS using SEPARATOR." (mapconcat 'identity strings separator))Would it be acceptable to provide separators to concat or is it preferable to use string-join instead?The latter. Func. `concat' accepts any arbitrary number of sequences (not a list of sequences as `string-join').I know that, but subr-x is experimental (hence not documented in the manual) and having to use mapconcat just to add a separator seems not practical.
Many people here like to use stuff from subr-x.el.Or you can create in your package a `foo-string-join' (foo being your package prefix). Once you write your package manual, this function will be documented in the Emacs manual as well.
We cannot modify `concat' with a new argument `separator' without breaking existent code.
You can pass the separator between strings: (concat "foo" ":" "bar" ":" "qux") => "foo:bar:qux" Or use format: (format "%s:%s:%s" "foo" "bar" "qux") => "foo:bar:qux"
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