feature request: add function inverse to `string-to-list`.

[Fuco1]

Add a function inverse to string-to-list.

Currently, one must do (apply 'string list) which is less than ideal in case we want to map or compose the (proposed, non existing) list-to-string function.

Could be called s-list-to-string or just s-to-string.

Awesome task for beginners :) !!!

[Fuco1]

Apparently concat does this... it might still warrant an alias because concat is totally undiscoverable when one wants to create a string from list of characters.

[wasamasa]

s.el doesn't have s-string-to-list or s-to-list...

[jasonm23]

Am I missing something? Isn't this s-split ?

[Fuco1]

I wanted a function doing this:

(string-to-list "hello")       ;; => (104 101 108 108 111)
;; inverse function
(concat (list ?h ?e ?l ?l ?o)) ;; => "hello"

[jasonm23]

Let's call it something more specific, how about s-to-chars or s-to-charlist ... something like that.

For me personally s-to-chars hits brevity and specificity on the nail, and gets my vote.

[jasonm23]

(defun s-to-chars (s)
 "split S into a list of chars."
 (mapcar 
   (lambda (it) (string-to-char it)) 
   (s-split "" s))

something like that

[jasonm23]

Or a bit tighter.

(defun s-to-chars (s)
 "split S into a list of chars."
 (mapcar 'string-to-char (s-split "" s))

[jasonm23]

(defexamples s-to-chars ()
  "Test splitting a string into a list of chars."
  (s-chars "hellloooo") => (0 104 101 108 108 108 111 111 111 111 0))

Ok, will have to strip those nils.

[jasonm23]

The inverse...

(s-from-chars (chars) ... 
;; or
(s-to-string (chars) ... 

The second one works best for me, the signature is telegraphing the source type. It's clear.

(defun s-to-string (chars)
  "Convert a list of CHARS to a string."
  (concat chars))

(defexamples s-to-string ()
  "Test char list to string conversion."
  (s-to-string '(104 101 108 108 111)) => "hello")

No nil problems this way around.

[jasonm23]

I can integrate these tomorrow.

[Fuco1]

string-to-list is a built-in which does this. You don't need to implement it.

This issue was only to provide an s api to that and the inverse function, which is also built in (concat).

[jasonm23]

You don't need to implement it.

The inverse is for symmetric integrity of the API (towards the goal of discoverable functionality.)

Is a PR coming?

[jasonm23]

Closing