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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
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---
from: http://rosettacode.org/wiki/Interactive_programming_(repl)
note: Basic language learning

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Many language implementations come with an ''interactive mode''.
This is a [[wp:command-line interpreter|command-line interpreter]] that reads lines from the user and evaluates these lines as statements or expressions.
An interactive mode may also be known as a ''command mode'',   a ''[[wp:read-eval-print loop|read-eval-print loop]]'' (REPL),   or a ''shell''.
;Task:
Show how to start this mode.
Then, as a small example of its use, interactively create a function of two strings and a separator that returns the strings separated by two concatenated instances of the separator &nbsp; (the 3<sup>rd</sup> argument).
;Example:
<big> f('Rosetta', 'Code', ':') </big>
should return
<big> 'Rosetta::Code' </big>
;Note:
This task is &nbsp; ''not'' &nbsp; about creating your own interactive mode.
<br><br>

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] 0 IF F$ = "F" THEN RESULT$ = P1$ + P3$ + P3$ + P2$: END
] F$ = "F":P1$ = "ROSETTA":P2$ = "CODE":P3$ = ":": GOTO
] ?RESULT$
ROSETTA::CODE

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10 DEF FN f$(a$, b$, s$) = a$+s$+s$+b$
PRINT FN f$("Rosetta", "Code", ":")

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Join {a 𝕊 bc: baac}
(function block)
":" Join "Rosetta""Code"
"Rosetta::Code"

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>set r=Rosetta
>set c=Code
>set s=:
>echo %r%%s%%s%%c%
Rosetta::Code
>

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$ brat
# Interactive Brat
brat:1> f = { a, b, s | a + s + s + b }
#=> function: 0xb737ac08
brat:2> f "Rosetta" "Code" ":"
#=> Rosetta::Code
brat:3> quit
Exiting

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C:\Burlesque>Burlesque.exe --shell
blsq ) {+]?+}hd"Rosetta""Code"':!a
"Rosetta:Code"
blsq )

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$ csh -f
% alias concat 'echo "\!:1\!:3\!:3\!:2"'
% concat Rosetta Code :
Rosetta::Code
%

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Clojure 1.1.0
user=> (defn f [s1 s2 sep] (str s1 sep sep s2))
#'user/f
user=> (f "Rosetta" "Code" ":")
"Rosetta::Code"
user=>

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$ coffee -n
coffee> f = (a, b, c) -> a + c + c + b
[Function]
coffee> f "Rosetta", "Code", ":"
"Rosetta::Code"

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$ rlwrap sbcl
This is SBCL 1.0.25, an implementation of ANSI Common Lisp.
More information about SBCL is available at <http://www.sbcl.org/>.
...
* (defun f (string-1 string-2 separator)
(concatenate 'string string-1 separator separator string-2))
F
* (f "Rosetta" "Code" ":")
"Rosetta::Code"
*

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$ rune # from an OS shell. On Windows there is also a desktop shortcut.

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? def f(string1 :String, string2 :String, separator :String) {
> return separator.rjoin(string1, "", string2)
> }
# value: <f>
? f("Rosetta", "Code", ":")
# value: "Rosetta::Code"

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;; screen copy of the REPL
;; note that the &i variables remember expression evaluation, and may be used in other expressions
EchoLisp - 2.16.2
📗 local-db: db.version: 3
(define ( f s1 s2 s3) (string-append s1 s3 s3 s2))
[0]→ f
(f "Rosetta" "Code" ":")
[1]→ "Rosetta::Code"
(+ 4 8)
[2]→ 12
(* 4 8)
[3]→ 32
(* &2 &3)
[4]→ 384
(f &1 &1 ":")
[5]→ "Rosetta::Code::Rosetta::Code"
;; etc.

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c:\Alex\ELENA\bin>elt
ELENA command line VM terminal 5.1.13 (C)2011-2020 by Alexei Rakov
ELENA VM 5.1.17 (C)2005-2020 by Alex Rakov
Initializing...
Done...
>f(s1,s2,sep){^ s1 + sep + sep + s2 };
>f("Rosetta","Code",":")
Rosetta::Code
>

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iex(1)> f = fn str1,str2,sep -> [str1,"",str2] |> Enum.join(sep) end # Join list on separator
iex(2)> g = fn str1,str2,sep -> str1 <> sep <> sep <> str2 end # Or concatenate strings
iex(3)> defmodule JoinStrings do
...(3)> def f(str1,str2,sep), do: [str1,"",str2] |> Enum.join(sep)
...(3)> def g(str1,str2,sep), do: str1 <> sep <> sep <> str2
...(3)> end

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iex(4)> f.("Rosetta","Code",":")
"Rosetta::Code"
iex(5)> JoinStrings.f("Rosetta","Code",":")
"Rosetta::Code"

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(defun my-join (str1 str2 sep)
(concat str1 sep sep str2))
my-join
(my-join "Rosetta" "Code" ":")
"Rosetta::Code"

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*** Welcome to IELM *** Type (describe-mode) for help.
ELISP> (defun my-join (str1 str2 sep)
(concat str1 sep sep str2))
my-join
ELISP> (my-join "Rosetta" "Code" ":")
"Rosetta::Code"
ELISP>

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$erl
1> F = fun(X,Y,Z) -> string:concat(string:concat(X,Z),string:concat(Z,Y)) end.
#Fun<erl_eval.18.105910772>
2> F("Rosetta", "Code", ":").
"Rosetta::Code"

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$ es
; fn concat a b s { result $a$s$s$b }
; echo <={concat Rosetta Code :}
Rosetta::Code
;

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Microsoft F# Interactive, (c) Microsoft Corporation, All Rights Reserved
F# Version 1.9.6.2, compiling for .NET Framework Version v2.0.50727
Please send bug reports to fsbugs@microsoft.com
For help type #help;;
> let f a b sep = String.concat sep [a; ""; b] ;;
val f : string -> string -> string -> string
> f "Rosetta" "Code" ":" ;;
val it : string = "Rosetta::Code"

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( scratchpad ) : cool-func ( w1 w2 sep -- res ) dup append glue ;
( scratchpad ) "Rosetta" "Code" ":" cool-func .
"Rosetta::Code"

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$ gforth
Gforth 0.7.0, Copyright (C) 1995-2008 Free Software Foundation, Inc.
Gforth comes with ABSOLUTELY NO WARRANTY; for details type `license'
Type `bye' to exit
ok
: f ( separator suffix prefix -- ) compiled
pad place 2swap 2dup compiled
pad +place compiled
pad +place compiled
pad +place compiled
pad count ; ok
ok
s" :" s" Code" s" Rosetta" f cr type
Rosetta::Code ok

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' FB 1.05.0 Win64
Dim As String s1, s2, sep
Input "First string "; s1
Input "Second string "; s2
Input "Separator "; sep
Print : Print s1 + sep + sep + s2
Sleep

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$ java -cp frink.jar frink.parser.Frink
f[a,b,s] := "$a$s$s$b"
f["Rosetta", "Code", ":"]

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~% gap
######### ###### ########### ###
############# ###### ############ ####
############## ######## ############# #####
############### ######## ##### ###### #####
###### # ######### ##### ##### ######
###### ########## ##### ##### #######
##### ##### #### ##### ###### ########
#### ##### ##### ############# ### ####
##### ####### #### #### ########### #### ####
##### ####### ##### ##### ###### #### ####
##### ####### ##### ##### ##### #############
##### ##### ################ ##### #############
###### ##### ################ ##### #############
################ ################## ##### ####
############### ##### ##### ##### ####
############# ##### ##### ##### ####
######### ##### ##### ##### ####
Information at: http://www.gap-system.org
Try '?help' for help. See also '?copyright' and '?authors'
Loading the library. Please be patient, this may take a while.
GAP4, Version: 4.4.12 of 17-Dec-2008, x86_64-unknown-linux-gnu-gcc
Components: small 2.1, small2 2.0, small3 2.0, small4 1.0, small5 1.0, small6 1.0, small7 1.0, small8 1.0,
small9 1.0, small10 0.2, id2 3.0, id3 2.1, id4 1.0, id5 1.0, id6 1.0, id9 1.0, id10 0.1, trans 1.0,
prim 2.1 loaded.
Packages: AClib 1.1, Polycyclic 2.6, Alnuth 2.2.5, AutPGrp 1.4, CrystCat 1.1.3, Cryst 4.1.6, CRISP 1.3.2,
CTblLib 1.1.3, TomLib 1.1.4, FactInt 1.5.2, GAPDoc 1.2, FGA 1.1.0.1, IRREDSOL 1.1.2, LAGUNA 3.5.0,
Sophus 1.23, Polenta 1.2.7, ResClasses 2.5.3 loaded.
gap> join := function(a, b, sep)
> return Concatenation(a, sep, sep, b);
> end;
function( a, b, sep ) ... end
gap>
gap> join("Rosetta", "Code", ":");
"Rosetta::Code"
gap>

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package main
import "fmt"
func f(s1, s2, sep string) string {
return s1 + sep + sep + s2
}
func main() {
fmt.Println(f("Rosetta", "Code", ":"))
}

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C:\Apps\groovy>groovysh
Groovy Shell (1.6.2, JVM: 1.6.0_13)
Type 'help' or '\h' for help.
---------------------------------------------------------------------------------------------------
groovy:000> f = { a, b, sep -> a + sep + sep + b }
===> groovysh_evaluate$_run_closure1@5e8d7d
groovy:000> println f('Rosetta','Code',':')
Rosetta::Code
===> null
groovy:000> exit
C:\Apps\groovy>

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$ ghci
___ ___ _
/ _ \ /\ /\/ __(_)
/ /_\// /_/ / / | | GHC Interactive, version 6.4.2, for Haskell 98.
/ /_\\/ __ / /___| | http://www.haskell.org/ghc/
\____/\/ /_/\____/|_| Type :? for help.
Loading package base-1.0 ... linking ... done.
Prelude> let f as bs sep = as ++ sep ++ sep ++ bs
Prelude> f "Rosetta" "Code" ":"
"Rosetta::Code"

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CHARACTER A*40, B*40, C*40
READ(Text=$CMD_LINE, Format="'','','',") A, B, C
WRITE(ClipBoard, Name) A, B, C ! A=Rosetta; B=Code; C=:;
WRITE(ClipBoard) TRIM(A) // ':' // TRIM(C) // TRIM(B) ! Rosetta::Code

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f=: [: ; 0 2 2 1&{
f 'Rosetta';'Code';':'
Rosetta::Code

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public static void main(String[] args) {
System.out.println(concat("Rosetta", "Code", ":"));
}
public static String concat(String a, String b, String c) {
return a + c + c + b;
}
Rosetta::Code

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$ java -cp js.jar org.mozilla.javascript.tools.shell.Main
Rhino 1.7 release 2 2009 03 22
js> function f(a,b,s) {return a + s + s + b;}
js> f('Rosetta', 'Code', ':')
Rosetta::Code
js> quit()
$

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$ rlwrap k
K Console - Enter \ for help
f:{x,z,z,y}
f["Rosetta";"Code";":"]
"Rosetta::Code"

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c:\kotlin-compiler-1.0.6>kotlinc
Welcome to Kotlin version 1.0.6-release-127 (JRE 1.8.0_31-b13)
Type :help for help, :quit for quit
>>> fun f(s1: String, s2: String, sep: String) = s1 + sep + sep + s2
>>> f("Rosetta", "Code", ":")
Rosetta::Code
>>> :quit

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{def F {lambda {:a :b :s} :a:s:s:b}}
-> F
{F Rosetta Code :}
-> Rosetta::Code

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$ lang -startShell

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Lang-Shell - Press CTRL + C for cancelling execution or for exiting!
• Copy with (CTRL + SHIFT + C) and paste with (CTRL + SHIT + V)
• Press CTRL + S for saving all inputs to a .lang file (Save)
• Press CTRL + SHIFT + S for saving all inputs to a .lang file (Save As...)
• Press CTRL + I for opening the special char input window
• Press CTRL + SHIFT + F for opening a file chooser to insert file paths
• Press UP and DOWN for scrolling through the history
• Press TAB and SHIFT + TAB for scrolling trough auto complete texts
◦ Press ENTER for accepting the auto complete text
• Press CTRL + L to clear the screen
• Use func.printHelp() to get information about LangShell functions
> fp.f = ($a, $b, $s) -> return $a$s$s$b
==> <Normal FP>
> fp.f(Rosetta, Code, :)
==> Rosetta::Code
>

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Lang-Shell - Press CTRL + C for cancelling execution or for exiting!
• Copy with (CTRL + SHIFT + C) and paste with (CTRL + SHIT + V)
• Press CTRL + S for saving all inputs to a .lang file (Save)
• Press CTRL + SHIFT + S for saving all inputs to a .lang file (Save As...)
• Press CTRL + I for opening the special char input window
• Press CTRL + SHIFT + F for opening a file chooser to insert file paths
• Press UP and DOWN for scrolling through the history
• Press TAB and SHIFT + TAB for scrolling trough auto complete texts
◦ Press ENTER for accepting the auto complete text
• Press CTRL + L to clear the screen
• Use func.printHelp() to get information about LangShell functions
> fn.setAutoPrintMode(NONE)
> fp.f = ($a, $b, $s) -> return $a$s$s$b
> fn.println(fp.f(Rosetta, Code, :))
Rosetta::Code
>

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#!/usr/bin/lasso9
// filename: interactive_demo
define concatenate_with_delimiter(
string1::string,
string2::string,
delimiter::string
) => #string1 + (#delimiter*2) + #string2
define read_input(prompt::string) => {
local(string)
// display prompt
stdout(#prompt)
// the following bits wait until the terminal gives you back a line of input
while(not #string or #string -> size == 0) => {
#string = file_stdin -> readsomebytes(1024, 1000)
}
#string -> replace(bytes('\n'), bytes(''))
return #string -> asstring
}
local(
string1,
string2,
delimiter
)
// get first string
#string1 = read_input('Enter the first string: ')
// get second string
#string2 = read_input('Enter the second string: ')
// get delimiter
#delimiter = read_input('Enter the delimiter: ')
// deliver the result
stdoutnl(concatenate_with_delimiter(#string1, #string2, #delimiter))

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> m=new(#script)
> m.scripttext="on conc(a,b,c)"&RETURN&"return a&c&c&b"&RETURN&"end"
> put conc("Rosetta", "Code", ":")
-- "Rosetta::Code"

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$ <i>logo</i>
Welcome to Berkeley Logo version 5.6
? <i>to f :prefix :suffix :separator</i>
> <i>output (word :prefix :separator :separator :suffix)</i>
> <i>end</i>
f defined
? <i>show f "Rosetta "Code ":</i>
Rosetta::Code
?

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$ lua
Lua 5.1.2 Copyright (C) 1994-2007 Lua.org, PUC-Rio
> function conc(a, b, c)
>> return a..c..c..b
>> end
> print(conc("Rosetta", "Code", ":"))
Rosetta::Code
>

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Read name1$, name2$, sep$
=name1$+sep$+sep$+name2$

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$ m4
define(`f',`$1`'$3`'$3`'$2')
==>
f(`Rosetta',`Code',`:')
==>Rosetta::Code
m4exit

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>> f = @(str1, str2, delim) [str1, delim, delim, str2];

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MCSKIP MT,<>
MCINS %.
MCDEF F WITHS (,,)
AS <%WA1.%WA3.%WA2.%WA2.>

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f := (a,b,c)->cat(a,c,c,b):
f("Rosetta","Code",":");

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f[x_,y_,z_]:=Print[x,z,z,y]
->""
f["Rosetta","Code",":"]
->Rosetta::Code

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(%i1) f(a, b, c) := sconcat(a, c, c, b)$
(%i2) f("Rosetta", "Code", ":");
(%o2) "Rosetta::Code"

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$ (dup suffix swap suffix suffix) :glue
$ "Rosetta" "Code" ":" glue puts!
Rosetta::Code
$

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proc f(x, y, z: string) = echo x, z, z, y
f("Rosetta", "Code", ":")

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import ../compiler/[nimeval, llstream]
runRepl(llStreamOpenStdIn().repl, [findNimStdLibCompileTime()], true)

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$ ocaml
Objective Caml version 3.12.1
# let f s1 s2 sep = String.concat sep [s1; ""; s2];;
val f : string -> string -> string -> string = <fun>
# f "Rosetta" "Code" ":";;
- : string = "Rosetta::Code"
#

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$ rlwrap ocaml

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$ octave
GNU Octave, version 3.0.2
Copyright (C) 2008 John W. Eaton and others.
This is free software; see the source code for copying conditions.
There is ABSOLUTELY NO WARRANTY; not even for MERCHANTIBILITY or
FITNESS FOR A PARTICULAR PURPOSE. For details, type `warranty'.
Octave was configured for "i586-mandriva-linux-gnu".
Additional information about Octave is available at http://www.octave.org.
Please contribute if you find this software useful.
For more information, visit http://www.octave.org/help-wanted.html
Report bugs to <bug@octave.org> (but first, please read
http://www.octave.org/bugs.html to learn how to write a helpful report).
For information about changes from previous versions, type `news'.
octave:1> function concat(a,b,c)
> disp(strcat(a,c,c,b));
> endfunction
octave:2> concat("Rosetta","Code",":");
Rosetta::Code
octave:3>

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: x(a, b, sep) a sep + sep + b + ;
ok
>x("Rosetta", "Code", ":")
ok
>.s
[1] (String) Rosetta::Code
ok
>

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> : x dup rot + + + ;
ok
> "Rosetta" "Code" ";" x .s
[1] (String) Rosetta::Code
ok
>

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$ ol
Welcome to Otus Lisp 2.1-2282-27a9b6c
type ',help' to help, ',quit' to end session.
> (define (f head tail mid)
(string-append head mid mid tail))
;; Defined f
> (f "Rosetta" "Code" ":")
"Rosetta::Code"
> ,quit
bye-bye :/

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declare fun {F As Bs Sep} {Append As Sep|Sep|Bs} end

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{System.showInfo {F "Rosetta" "Code" &:}}

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f(s1,s2,sep)=Str(s1, sep, sep, s2);

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$ perl -de1
Loading DB routines from perl5db.pl version 1.3
Editor support available.
Enter h or `h h' for help, or `man perldebug' for more help.
main::(-e:1): 1
DB<1> sub f {my ($s1, $s2, $sep) = @_; $s1 . $sep . $sep . $s2}
DB<2> p f('Rosetta', 'Code', ':')
Rosetta::Code
DB<3> q

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$ perl
# Write the script here and press Ctrl+D plus ENTER when finished (^D means Ctrl+D):
sub f {my ($s1, $s2, $sep) = @_; $s1 . $sep . $sep . $s2};
print f('Rosetta', 'Code', ':');
^D
Rosetta::Code
$

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$ perl -lpe '$_=eval||$@'
sub f { join '' => @_[0, 2, 2, 1] }
f qw/Rosetta Code :/
Rosetta::Code

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: (de f (Str1 Str2 Sep)
(pack Str1 Sep Sep Str2) )
-> f
: (f "Rosetta" "Code" ":")
-> "Rosetta::Code"

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$ pike
Pike v7.8 release 352 running Hilfe v3.5 (Incremental Pike Frontend)
> string f(string first, string second, string sep){
>> return(first + sep + sep + second);
>> }
> f("Rosetta","Code",":");
(1) Result: "Rosetta::Code"
>

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Windows PowerShell
Copyright (C) 2009 Microsoft Corporation. All rights reserved.
PS Home:\> function f ([string] $string1, [string] $string2, [string] $separator) {
>> $string1 + $separator * 2 + $string2
>> }
>>
PS Home:\> f 'Rosetta' 'Code' ':'
Rosetta::Code
PS Home:\>

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% library(win_menu) compiled into win_menu 0.00 sec, 12,872 bytes
% library(swi_hooks) compiled into pce_swi_hooks 0.00 sec, 2,404 bytes
% The graphical front-end will be used for subsequent tracing
% c:/users/joel-seven/appdata/roaming/swi-prolog/pl.ini compiled 0.13 sec, 876,172 bytes
XPCE 6.6.66, July 2009 for Win32: NT,2000,XP
Copyright (C) 1993-2009 University of Amsterdam.
XPCE comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to redistribute it under certain conditions.
The host-language is SWI-Prolog version 5.10.0
For HELP on prolog, please type help. or apropos(topic).
on xpce, please type manpce.
1 ?- assert((f(A, B,C) :- format('~w~w~w~w~n', [A, C, C, B]))).
true.
2 ?- f('Rosetta', 'Code', ':').
Rosetta::Code
true.
3 ?-

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python
Python 2.6.1 (r261:67517, Dec 4 2008, 16:51:00) [MSC v.1500 32 bit (Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> def f(string1, string2, separator):
return separator.join([string1, '', string2])
>>> f('Rosetta', 'Code', ':')
'Rosetta::Code'
>>>

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$ quackery
Welcome to Quackery.
Enter "leave" to leave the shell.
/O> [ dup join swap join join ] is f ( [ [ [ --> [ )
...
Stack empty.
/O> $ 'Rosetta' $ 'Code' $ ':' f
...
Stack: [ 82 111 115 101 116 116 97 58 58 67 111 100 101 ]
/O> echo$
...
Rosetta::Code
Stack empty.
/O>

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$ R
R version 2.7.2 (2008-08-25)
Copyright (C) 2008 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.
Natural language support but running in an English locale
R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.
Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.
> f <- function(a, b, s) paste(a, "", b, sep=s)
> f("Rosetta", "Code", ":")
[1] "Rosetta::Code"
> q()
Save workspace image? [y/n/c]: n

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$ rebol -q
>> f: func [a b s] [print rejoin [a s s b]]
>> f "Rosetta" "Code" ":"
Rosetta::Code
>> q

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/*REXX*/ parse arg a b c
say f(a,b,c)
exit
f:return arg(1)arg(3)arg(3)arg(2)

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/*REXX program demonstrates interactive programming by using a function [F]. */
say f('Rosetta', "Code", ':')
say f('The definition of a trivial program is ', " one that has no bugs.", '')
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
f: return arg(1) || copies(arg(3),2) || arg(2) /*return the required string to invoker*/

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/*REXX program demonstrates interactive programming by using a function [F]. */
say ' enter the function F with three comma-separated arguments:'
parse pull funky
interpret 'SAY' funky
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
f: return arg(1) || copies(arg(3),2) || arg(2) /*return the required string to invoker*/

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oiseau:/tmp> racket
Welcome to Racket v5.3.3.5.
> (define (f string-1 string-2 separator)
(string-append string-1 separator separator string-2))
> (f "Rosetta" "Code" ":")
"Rosetta::Code"
> ^D
oiseau:/tmp>

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$ rakudo/perl6
> sub f($str1,$str2,$sep) { $str1~$sep x 2~$str2 };
f
> f("Rosetta","Code",":");
Rosetta::Code
>

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@ -0,0 +1,2 @@
:f (sss-s) [ s:prepend ] sip s:prepend s:append ;
'Rosetta 'Code ': f

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@ -0,0 +1,4 @@
r = "Rosetta"
c = "Code"
s = ":"
see r+s+s+c

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$ irb
irb(main):001:0> def f(string1, string2, separator)
irb(main):002:1> [string1, '', string2].join(separator)
irb(main):003:1> end
=> :f
irb(main):004:0> f('Rosetta', 'Code', ':')
=> "Rosetta::Code"
irb(main):005:0> exit
$

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name: myapp
version: "1.0"
author: A Rust Developer <rustme@home.com>
about: Does awesome things
args:
- STRING1:
about: First string to use
required: true
index: 1
- STRING2:
about: Second string to use
required: true
index: 2
- SEPARATOR:
about: Separtor to use
required: true
index: 3

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[dependencies]
clap = { version = "3.0.0-beta.2", features = ["yaml"] }

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#[macro_use]
extern crate clap;
use clap::App;
fn main() {
let yaml = load_yaml!("cli.yaml");
let matches = App::from(yaml).get_matches();
let str1 = matches.value_of("STRING1").unwrap();
let str2 = matches.value_of("STRING2").unwrap();
let str3 = matches.value_of("SEPARATOR").unwrap();
println!("{:?}", f(&str1, &str2, &str3));
}
fn f<'a>(s1: &'a str, s2: &'a str, sep :&'a str) -> String{
[s1,sep,sep,s2].iter().map(|x| *x).collect()
}

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> slsh<Enter>
slsh version 0.9.1-2; S-Lang version: pre2.3.1-23
Copyright (C) 2005-2014 John E. Davis <jed@jedsoft.org>
This is free software with ABSOLUTELY NO WARRANTY.
slsh> define f(s1, s2, sep) {<Enter>
return(strcat(s1, sep, sep, s2));<Enter>
}<Enter>
slsh> f("Rosetta", "Code", ":");<Enter>
Rosetta::Code
slsh> quit<Enter>
>

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C:\>scala
Welcome to Scala version 2.8.0.r21356-b20100407020120 (Java HotSpot(TM) Client V
M, Java 1.6.0_05).
Type in expressions to have them evaluated.
Type :help for more information.
scala> "rosetta"
res0: java.lang.String = rosetta

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@ -0,0 +1,22 @@
scala> "rosetta".
!= ## $asInstanceOf
$isInstanceOf + ==
charAt clone codePointAt
codePointBefore codePointCount compareTo
compareToIgnoreCase concat contains
contentEquals endsWith eq
equals equalsIgnoreCase finalize
getBytes getChars getClass
hashCode indexOf intern
isEmpty lastIndexOf length
matches ne notify
notifyAll offsetByCodePoints regionMatches
replace replaceAll replaceFirst
split startsWith subSequence
substring synchronized this
toCharArray toLowerCase toString
toUpperCase trim wait
scala> "rosetta".+(":")
res1: java.lang.String = rosetta:

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scala> val str1 = "rosetta"
str1: java.lang.String = rosetta

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scala> val str2 = "code"
str2: java.lang.String = code
scala> val separator = ":"
separator: java.lang.String = :
scala> str1 + separator + str2
res2: java.lang.String = rosetta:code

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scala> def (str1: String, str2: String, separator: String) =
<console>:1: error: identifier expected but '(' found.
def (str1: String, str2: String, separator: String) =
^

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scala> def f(str1: String, str2: String, separator: String) =
| str1 + separator + str2
f: (str1: String,str2: String,separator: String)java.lang.String
scala> f("rosetta", "code", ":")
res3: java.lang.String = rosetta:code
scala> f("code", "rosetta", ", ")
res4: java.lang.String = code, rosetta

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scala> .length
res5: Int = 13
scala>

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@ -0,0 +1,5 @@
scala> Array(1, 2, 3, 4)
res8: Array[Int] = Array(1, 2, 3, 4)
scala> println(res8)
[I@383244

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> scheme
Scheme Microcode Version 14.9
MIT Scheme running under FreeBSD
Type `^C' (control-C) followed by `H' to obtain information about interrupts.
Scheme saved on Monday June 17, 2002 at 10:03:44 PM
Release 7.7.1
Microcode 14.9
Runtime 15.1
1 ]=> (define (f string-1 string-2 separator)
(string-append string-1 separator separator string-2))
;Value: f
1 ]=> (f "Rosetta" "Code" ":")
;Value 1: "Rosetta::Code"
1 ]=> ^D
End of input stream reached
Happy Happy Joy Joy.
>

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> scheme48
Welcome to Scheme 48 1.8 (made by root on Wed Sep 24 22:37:08 UTC 2008)
Copyright (c) 1993-2008 by Richard Kelsey and Jonathan Rees.
Please report bugs to scheme-48-bugs@s48.org.
Get more information at http://www.s48.org/.
Type ,? (comma question-mark) for help.
> (define (f string-1 string-2 separator)
(string-append string-1 separator separator string-2))
; no values returned
> (f "Rosetta" "Code" ":")
"Rosetta::Code"
> ^D
Exit Scheme 48 (y/n)? ^D
I'll only ask another 100 times.
Exit Scheme 48 (y/n)? ^D
I'll only ask another 99 times.
Exit Scheme 48 (y/n)? y
>

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