String append
You are encouraged to solve this task according to the task description, using any language you may know.
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |
Comparison |
Matching
Memory Operations
Pointers & references |
Addresses
Most languages provide a way to concatenate two string values, but some languages also provide a convenient way to append in-place to an existing string variable without referring to the variable twice.
- Task
Create a string variable equal to any text value.
Append the string variable with another string literal in the most idiomatic way, without double reference if your language supports it.
Show the contents of the variable after the append operation.
AArch64 Assembly
<lang AArch64 Assembly> /* ARM assembly AARCH64 Raspberry PI 3B */ /* program appendstr64.s */
/*******************************************/ /* Constantes file */ /*******************************************/ /* for this file see task include a file in language AArch64 assembly*/ .include "../includeConstantesARM64.inc"
.equ BUFFERSIZE, 100 /*******************************************/ /* Initialized data */ /*******************************************/ .data szMessString: .asciz "String :\n" szString1: .asciz "Alphabet : " sComplement: .fill BUFFERSIZE,1,0 szString2: .asciz "abcdefghijklmnopqrstuvwxyz"
szCarriageReturn: .asciz "\n" /*******************************************/ /* UnInitialized data */ /*******************************************/ .bss /*******************************************/ /* code section */ /*******************************************/ .text .global main main:
ldr x0,qAdrszMessString // display message bl affichageMess ldr x0,qAdrszString1 // display begin string bl affichageMess ldr x0,qAdrszCarriageReturn // display return line bl affichageMess ldr x0,qAdrszString1 ldr x1,qAdrszString2 bl append // append sting2 to string1 ldr x0,qAdrszMessString bl affichageMess ldr x0,qAdrszString1 // display string bl affichageMess ldr x0,qAdrszCarriageReturn bl affichageMess
100: // standard end of the program
mov x0,0 // return code mov x8,EXIT // request to exit program svc 0 // perform system call
qAdrszMessString: .quad szMessString qAdrszString1: .quad szString1 qAdrszString2: .quad szString2 qAdrszCarriageReturn: .quad szCarriageReturn /**************************************************/ /* append two strings */ /**************************************************/ /* x0 contains the address of the string1 */ /* x1 contains the address of the string2 */ append:
stp x1,lr,[sp,-16]! // save registers mov x2,#0 // counter byte string 1
1:
ldrb w3,[x0,x2] // load byte string 1 cmp x3,#0 // zero final ? add x4,x2,1 csel x2,x4,x2,ne // if x3 not equal 0, x2 = X2 +1 else x2 bne 1b // no -> loop mov x4,#0 // counter byte string 2
2:
ldrb w3,[x1,x4] // load byte string 2 strb w3,[x0,x2] // store byte string 1 cbz x3,100f // zero final ? add x2,x2,1 // no -> increment counter 1 add x4,x4,1 // no -> increment counter 2 b 2b // no -> loop
100:
ldp x1,lr,[sp],16 // restaur 2 registers ret // return to address lr x30
/********************************************************/ /* File Include fonctions */ /********************************************************/ /* for this file see task include a file in language AArch64 assembly */ .include "../includeARM64.inc" </lang>
- Output:
String : Alphabet : String : Alphabet : abcdefghijklmnopqrstuvwxyz
Ada
<lang ada> with Ada.Strings.Unbounded; use Ada.Strings.Unbounded; with Ada.Text_IO.Unbounded_Io; use Ada.Text_IO.Unbounded_IO;
procedure String_Append is
Str : Unbounded_String := To_Unbounded_String("Hello");
begin
Append(Str, ", world!"); Put_Line(Str);
end String_Append; </lang>
- Output:
Hello, world!
ALGOL 68
File: String_append.a68<lang algol68>#!/usr/bin/a68g --script #
- -*- coding: utf-8 -*- #
STRING str := "12345678"; str +:= "9!"; print(str)</lang>
- Output:
123456789!
ARM Assembly
<lang ARM Assembly> /* ARM assembly Raspberry PI */ /* program appendstr.s */
/* Constantes */ .equ STDOUT, 1 @ Linux output console .equ EXIT, 1 @ Linux syscall .equ WRITE, 4 @ Linux syscall
.equ BUFFERSIZE, 100
/* Initialized data */ .data szMessString: .asciz "String :\n" szString1: .asciz "Alphabet : " sComplement: .fill BUFFERSIZE,1,0 szString2: .asciz "abcdefghijklmnopqrstuvwxyz"
szCarriageReturn: .asciz "\n"
/* UnInitialized data */ .bss
/* code section */ .text .global main main:
ldr r0,iAdrszMessString @ display message bl affichageMess ldr r0,iAdrszString1 @ display begin string bl affichageMess ldr r0,iAdrszCarriageReturn @ display line return bl affichageMess ldr r0,iAdrszString1 ldr r1,iAdrszString2 bl append @ append sting2 to string1 ldr r0,iAdrszMessString bl affichageMess ldr r0,iAdrszString1 @ display string bl affichageMess ldr r0,iAdrszCarriageReturn bl affichageMess
100: @ standard end of the program
mov r0, #0 @ return code mov r7, #EXIT @ request to exit program svc 0 @ perform system call
iAdrszMessString: .int szMessString iAdrszString1: .int szString1 iAdrszString2: .int szString2 iAdrszCarriageReturn: .int szCarriageReturn /******************************************************************/ /* append two strings */ /******************************************************************/ /* r0 contains the address of the string1 */ /* r1 contains the address of the string2 */ append:
push {r0,r1,r2,r7,lr} @ save registers mov r2,#0 @ counter byte string 1
1:
ldrb r3,[r0,r2] @ load byte string 1 cmp r3,#0 @ zero final ? addne r2,#1 bne 1b @ no -> loop mov r4,#0 @ counter byte string 2
2:
ldrb r3,[r1,r4] @ load byte string 2 strb r3,[r0,r2] @ store byte string 1 cmp r3,#0 @ zero final ? addne r2,#1 @ no -> increment counter 1 addne r4,#1 @ no -> increment counter 2 bne 2b @ no -> loop
100:
pop {r0,r1,r2,r7,lr} @ restaur registers bx lr @ return
/******************************************************************/ /* display text with size calculation */ /******************************************************************/ /* r0 contains the address of the message */ affichageMess:
push {r0,r1,r2,r7,lr} @ save registers mov r2,#0 @ counter length */
1: @ loop length calculation
ldrb r1,[r0,r2] @ read octet start position + index cmp r1,#0 @ if 0 its over addne r2,r2,#1 @ else add 1 in the length bne 1b @ and loop @ so here r2 contains the length of the message mov r1,r0 @ address message in r1 mov r0,#STDOUT @ code to write to the standard output Linux mov r7, #WRITE @ code call system "write" svc #0 @ call system pop {r0,r1,r2,r7,lr} @ restaur registers bx lr @ return
</lang>
Arturo
<lang rebol>print join ["Hello" "World"]
a: "Hello" 'a ++ "World" print a
b: "Hello" append 'b "World" print b
c: "Hello" print append c "World"</lang>
- Output:
HelloWorld HelloWorld HelloWorld HelloWorld
AutoHotkey
<lang autohotkey>s := "Hello, " s .= "world." MsgBox % s</lang>
- Output:
Hello, world.
Avail
Avail's normal strings are immutable, however string variables can leverage tuple's appending-assignment method, _↑++=_
.
<lang Avail>str : string := "99 bottles of "; str ++= "beer"; Print: str;</lang>
Note that one can define methods similar to this, thanks to the variable occurrence message pattern, _↑
, whose slot accepts a variable usage and then passes the variable container itself as the corresponding argument. Consider the source for the append used above:
<lang Avail>Public method "_↑++=_" is
[
var : read tuple/write ⊥,
t : tuple
|
var ?= eject var ++ t;
] : ⊤;</lang>
(eject
and ?=
are methods used for unassign-retrieving and assigning to a variable, respectively, only needed when dealing with the containers themselves.)
AWK
<lang AWK>
- syntax: GAWK -f STRING_APPEND.AWK
BEGIN {
s = "foo" s = s "bar" print(s) exit(0)
} </lang>
- Output:
foobar
Axe
<lang axe>Lbl STRCAT Copy(r₂,r₁+length(r₁),length(r₂)+1) r₁ Return</lang>
BASIC
Applesoft BASIC
<lang BASIC>S$ = "Hello" S$ = S$ + " World!" PRINT S$</lang>
BaCon
<lang freebasic> A$ = "Hello" A$ = A$ & " World!" PRINT A$ </lang>
BBC BASIC
<lang BBC BASIC> S$="Hello"
S$+=" World!" PRINT S$ END</lang>
- Output:
Hello World!
IS-BASIC
<lang IS-BASIC>100 LET S$="Hello" 110 LET S$=S$&" World!" 120 PRINT S$</lang>
Bracmat
<lang Bracmat>str="Hello"; str$(!str " World!"):?str; out$!str;</lang>
- Output:
Hello World!
C
<lang c>#include<stdio.h>
- include<string.h>
int main() {
char str[24]="Good Morning"; char *cstr=" to all"; char *cstr2=" !!!"; int x=0; //failure when space allocated to str is insufficient.
if(sizeof(str)>strlen(str)+strlen(cstr)+strlen(cstr2)) { /* 1st method*/ strcat(str,cstr);
/*2nd method*/ x=strlen(str); sprintf(&str[x],"%s",cstr2);
printf("%s\n",str);
} return 0;
}</lang>
- Output:
Good Morning to all !!!
C#
<lang csharp>class Program {
static void Main(string[] args) { string x = "foo"; x += "bar"; System.Console.WriteLine(x); }
}</lang>
C++
<lang cpp>#include <iostream>
- include <string>
int main( ) {
std::string greeting( "Hello" ) ; greeting.append( " , world!" ) ; std::cout << greeting << std::endl ; return 0 ;
}</lang>
- Output:
Hello , world!
Clojure
Using global vars. <lang clojure>user=> (def s "app")
- 'user/s
user=> s "app" user=> (def s (str s "end"))
- 'user/s
user=> s "append"</lang>
Using local bindings. <lang clojure> user=> (let [s "ap", s (str s "pend")] s) "append"</lang>
COBOL
COBOL is not really a variable length field programming language. Most data items are fixed in size at compile time.
This example uses OCCURS DEPENDING ON, and reference modification to simulate a string append, all within an already maximally bounded character field. This type of programming task, while possible, is not overly common in COBOL applications.
<lang COBOL> identification division.
program-id. string-append.
data division. working-storage section. 01 some-string. 05 elements pic x occurs 0 to 80 times depending on limiter. 01 limiter usage index value 7. 01 current usage index.
procedure division. append-main.
move "Hello, " to some-string
*> extend the limit and move using reference modification set current to length of some-string set limiter up by 5 move "world" to some-string(current + 1:) display some-string
goback. end program string-append.
</lang>
- Output:
$ cobc -xj string-append.cob Hello, world
CoffeeScript
<lang coffeescript>a = "Hello, " b = "World!" c = a + b
console.log c</lang> Or with concat: <lang coffeescript>console.log "Hello, ".concat "World!"</lang>
- Output:
Hello, World!
Common Lisp
Similar to the Racket solution, a macro is necessary to append in-place: <lang lisp>(defmacro concatenatef (s &rest strs)
"Append additional strings to the first string in-place." `(setf ,s (concatenate 'string ,s ,@strs)))
(defvar *str* "foo") (concatenatef *str* "bar") (format T "~a~%" *str*) (concatenatef *str* "baz" "abc" "def") (format T "~a~%" *str*)</lang>
Output:
foobar foobarbazabcdef
D
<lang d>import std.stdio;
void main() {
string s = "Hello"; s ~= " world!"; writeln(s);
}</lang>
- Output:
Hello world!
Dyalect
<lang Dyalect>var s = "foo" s += "bar" print(s)</lang>
EasyLang
<lang>a$ = "hello" a$ &= " world" print a$</lang>
EchoLisp
<lang lisp>
- Solution from Common Lisp and Racket
(define-syntax-rule (set-append! str tail)
(set! str (string-append str tail)))
(define name "Albert") → name
(set-append! name " de Jeumont-Schneidre") name
→ "Albert de Jeumont-Schneidre"
</lang>
Elena
ELENA 4.x : <lang elena>import extensions; import extensions'text;
public program() {
var s := StringWriter.load("Hello"); s.append:" World"; console.printLine:s.readChar()
}</lang>
Elixir
<lang elixir>iex(60)> s = "Hello" "Hello" iex(61)> s <> " World!" "Hello World!"</lang>
Emacs Lisp
version 1
<lang Emacs Lisp> (defun glue (str1 str2)
(concat str1 str2) )
</lang>
version 2
<lang Emacs Lisp> (defun glue (str1 str2)
(format "%s%s" str1 str2) )
</lang> Eval: <lang Emacs Lisp> (setq str "Hello, ") (setq str (glue str "World!") ) (insert str) </lang> Output:
Hello, World!
Erlang
- Output:
1> S = "Hello". "Hello" 2> S ++ " world". "Hello world"
Euphoria
<lang euphoria> sequence string = "String"
printf(1,"%s\n",{string})
string &= " is now longer\n"
printf(1,"%s",{string}) </lang>
- Output:
String String is now longer
F#
Strings are immutable in .NET. To append (to the same variable) the variable has to be declared mutable. <lang fsharp>let mutable x = "foo" x <- x + "bar" printfn "%s" x</lang>
Factor
<lang factor>"Hello, " "world!" append</lang>
- Output:
"Hello, world!"
Falcon
<lang falcon> /* Added by Aykayayciti Earl Lamont Montgomery April 10th, 2018 */
s1, s2 = "Hello", "Foo" > s1 + " World" printl(s2 + " bar") </lang>
- Output:
Hello World Foo bar [Finished in 0.2s]
Forth
<lang Forth>\ Strings in Forth are simply named memory locations
create astring 256 allot \ create a "string"
s" Hello " astring PLACE \ initialize the string
s" World!" astring +PLACE \ append with "+place"</lang>
Test at the console
<lang> ok s" Hello " astring place ok s" World!" astring +place ok astring count type Hello World! ok </lang>
Fortran
Using deferred length character strings:
<lang Fortran> program main
character(len=:),allocatable :: str
str = 'hello' str = str//' world'
write(*,*) str
end program main </lang>
- Output:
hello world
Using pre-allocated character strings:
<lang Fortran> program str_append
implicit none
character(len=20) :: str
str= 'String' str(len_trim(str)+1:) = 'Append' print *, str
end program str_append </lang>
- Output:
StringAppend
FreeBASIC
<lang freebasic>' FB 1.05.0 Win64
Var s = "String" s += " append" Print s Sleep</lang>
- Output:
String append
Gambas
Click this link to run this code <lang gambas>Public Sub Main() Dim sString As String = "Hello "
sString &= "World!" Print sString
End</lang> Output:
Hello World!
Genie
<lang genie>[indent=4] /* String append, in Genie */ init
str:string = "Hello" str += ", world"
print str</lang>
- Output:
prompt$ valac stringAppend.gs prompt$ ./stringAppend Hello, world
GlovePIE
<lang glovepie>var.string="This is " var.string+="Sparta!" debug=var.string</lang>
Go
<lang go>s := "foo" s += "bar"</lang>
String Builder
The first solution redefines the string variable every time. It might be short in code but it uses much CPU cycles. A better way is to use `string.Builder` but it is not a string. It is more like a buffer which can produce a string. And it really appends the string to the existing variable. <lang go> package main
import (
"fmt" "strings"
)
func main() {
var s strings.Builder s.WriteString("foo") s.WriteString("bar") fmt.Print(s.String())
} </lang>
- Output:
foobar
Gosu
<lang gosu>// Example 1 var s = "a" s += "b" s += "c" print(s)
// Example 2 print("a" + "b" + "c")
// Example 3 var a = "a" var b = "b" var c = "c" print("${a}${b}${c}")</lang>
- Output:
abc abc abc
Groovy
<lang Groovy> class Append{ static void main(String[] args){ def c="Hello "; def d="world"; def e=c+d; println(e); } } </lang>
- Output:
Hello world
Haskell
<lang haskell> main = putStrLn ("Hello" ++ "World") </lang>
Icon and Unicon
In both languages you can:
<lang unicon> procedure main()
s := "foo" s ||:= "bar" write(s)
end </lang>
Outputs:
->ss foobar ->
J
<lang j> s=: 'new'
s
new
s=: s,' value' NB. append is in-place s
new value</lang>
Java
<lang Java>String sa = "Hello"; sa += ", World!"; System.out.println(sa);
StringBuilder ba = new StringBuilder(); ba.append("Hello"); ba.append(", World!"); System.out.println(ba.toString());</lang>
- Output:
Hello, World! Hello, World!
JavaScript
<lang JavaScript>var s1 = "Hello"; s1 += ", World!"; print(s1);
var s2 = "Goodbye"; // concat() returns the strings together, but doesn't edit existing string // concat can also have multiple parameters print(s2.concat(", World!"));</lang>
- Output:
"Hello, World!" "Goodbye, World!"
jq
jq's +
operator can be used to append two strings, and under certain circumstances the +=
operator can be used as an abbreviation for appending a string to an existing string. For example, all three of the following produce the same output:<lang jq>"Hello" | . += ", world!"
["Hello"] | .[0] += ", world!" | .[0]
{ "greeting": "Hello"} | .greeting += ", world!" | .greeting</lang>
However the +=
operator cannot be used with jq variables in the conventional manner. One could nevertheless use the technique illustrated by the following:<lang jq>"Hello" as $a | $a | . += ", world!" as $a | $a</lang>
Jsish
From Javascript entry. <lang javascript>/* String append, in Jsish */ var str = 'Hello';
- str += ', world';
var s2 = 'Goodbye';
- s2.concat(', World!');
/*
!EXPECTSTART!
str += ', world' ==> Hello, world s2.concat(', World!') ==> Goodbye, World!
!EXPECTEND!
- /</lang>
- Output:
prompt$ jsish --U stringAppend.jsi str += ', world' ==> Hello, world s2.concat(', World!') ==> Goodbye, World!
Julia
<lang julia>s = "Hello" s *= ", world!"</lang>
- Output:
"Hello, world!"
Kotlin
<lang kotlin>fun main(args: Array<String>) {
var s = "a" s += "b" s += "c" println(s) println("a" + "b" + "c") val a = "a" val b = "b" val c = "c" println("$a$b$c")
}</lang>
- Output:
abc abc abc
Lambdatalk
In Lambdatalk writing {def name a sequence of words} replaces the sequence of words by the given name in the code string. The name is a word and is not evaluated. Bracketing a name between two curly braces returns its related value. And concatenating named strings is simply done by writing names between curly braces and separated by spaces. <lang Scheme> {def christian_name Albert} -> christian_name {def name de Jeumont-Schneidre} -> name
{christian_name} {name} -> Albert de Jeumont-Schneidre </lang>
langur
<lang langur>var .s = "no more " .s ~= "foo bars" writeln .s</lang>
- Output:
no more foo bars
Lasso
<lang Lasso>local(x = 'Hello')
- x->append(', World!')
- x</lang>
- Output:
Hello, World!
Lingo
<lang lingo>str = "Hello" put " world!" after str put str -- "Hello world!"</lang>
LiveCode
Livecode has an "after" keyword for this <lang LiveCode>local str="live" put "code" after str</lang> Output is "livecode"
Lua
Not possible as strings are immutable. We can demonstrate their immutability using 'self': <lang Lua>function string:show ()
print(self)
end
function string:append (s)
self = self .. s
end
x = "Hi " x:show() x:append("there!") x:show()</lang>
- Output:
Hi Hi
You can of course concatentate them and store the result in the original variable name but that requires a double reference: <lang Lua>x = "Hi " x = x .. "there!" print(x)</lang>
- Output:
Hi there!
M2000 Interpreter
Documents in M2000 are objects with paragraphs.
<lang M2000 Interpreter> a$="ok" a$+="(one)" Print a$
Document b$ b$="ok" b$="(one)" Print b$ </lang>
- Output:
ok(one) ok(one)
Maple
<lang maple>a := "Hello"; b := cat(a, " World"); c := `||`(a, " World");</lang>
- Output:
"Hello" "Hello World" "Hello World"
Mathematica
<lang Mathematica> (* mutable strings are not supported *) s1 = "testing"; s1 = s1 <> " 123"; s1</lang>
- Output:
"testing 123"
min
<lang min>(quote cons "" join) :str-append
"foo" "bar" str-append puts!</lang>
- Output:
foobar
MontiLang
<lang MontiLang>|Hello | |world!| swap + print</lang> <lang MontiLang>|Hello | var hello . |world!| var world . world hello + print</lang>
Nanoquery
<lang Nanoquery>s1 = "this is" s1 += " a test"
println s1</lang>
- Output:
this is a test
Neko
The plus operator +, concats strings.
<lang ActionScript>/**
<doc>
String append in Neko</doc>
- /
var str = "Hello" str += ", world" $print(str, "\n")</lang>
- Output:
prompt$ nekoc string-append.neko prompt$ neko ./string-append.n Hello, world
NetRexx
<lang NetRexx>s_ = 'Hello' s_ = s_', world!' say s_</lang>
- Output:
Hello, world!
NewLISP
<lang NewLISP>(setq str "foo")
(push "bar" str -1)
- or as an alternative introduced in v.10.1
(extend str "bar")
(println str) </lang>
Nim
<lang nim>var str = "123456" str.add("78") # two ways str &= "9!" # to append</lang>
NS-HUBASIC
<lang NS-HUBASIC>10 S$ = "HELLO" 20 S$ = S$ + " WORLD!" 30 PRINT S$</lang>
Objeck
<lang objeck> class Append {
function : Main(args : String[]) ~ Nil { x := "foo"; x->Append("bar"); x->PrintLine(); }
} </lang>
OCaml
<lang ocaml>let () =
let s = Buffer.create 17 in Buffer.add_string s "Bonjour"; Buffer.add_string s " tout le monde!"; print_endline (Buffer.contents s)</lang>
- Output:
Bonjour tout le monde!
Oforth
<lang Oforth>StringBuffer new "Hello, " << "World!" << println</lang>
PARI/GP
Not supported in GP. <lang parigp>s = "Hello"; s = Str(s, ", world!")</lang>
- Output:
%1 = "Hello, world!"
Pascal
<lang Pascal>program StringAppend; {$mode objfpc}{$H+}
uses
{$IFDEF UNIX}{$IFDEF UseCThreads} cthreads, {$ENDIF}{$ENDIF} Classes { you can add units after this };
var
s: String = 'Hello';
begin
s += ' World !'; WriteLn(S); ReadLn;
end.</lang> Output:
Hello World !
Perl
<lang perl>my $str = 'Foo'; $str .= 'bar'; print $str;</lang>
- Output:
Foobar
Phix
<lang Phix>string s = "this string" ?s s &= " is now longer" ?s</lang>
- Output:
"this string" "this string is now longer"
PicoLisp
<lang picolisp>(setq Str1 "12345678") (setq Str1 (pack Str1 "9!")) (println Str1)</lang>
- Output:
"123456789!"
Pike
<lang Pike> string msg = "hello"; msg += " world"; write(msg +"\n"); </lang>
- Output:
hello world
PL/I
<lang PL/I>Cat: procedure options (main);
declare s character (100) varying; s = 'dust '; s ||= 'bowl'; put (s);
end Cat;</lang>
dust bowl
Plain English
<lang plainenglish>To run: Start up. Put "abc" into a string. Append "123" to the string. Write the string to the console. Wait for the escape key. Shut down.</lang>
- Output:
abc123
Plain TeX
Works with any TeX engine <lang tex>\def\addtomacro#1#2{\expandafter\def\expandafter#1\expandafter{#1#2}} \def\foo{Hello} Initial: \foo
\addtomacro\foo{ world!} Appended: \foo \bye</lang>
pdf or dvi output:
Initial: Hello Appended: Hello world!
PowerShell
<lang PowerShell> $str = "Hello, " $str += "World!" $str </lang>
Hello, World!
PureBasic
<lang purebasic>S$ = "Hello" S$ = S$ + " Wo" ;by referencing the string twice S$ + "rld!" ;by referencing the string once If OpenConsole()
PrintN(S$)
Print(#CRLF$ + #CRLF$ + "Press ENTER to exit"): Input() CloseConsole()
EndIf</lang> Sample output:
Hello World!
Python
File: String_append.py<lang python>#!/usr/bin/env python
- -*- coding: utf-8 -*- #
str = "12345678"; str += "9!"; print(str)</lang>
- Output:
123456789!
Racket
<lang racket>;there is no built-in way to set! append in racket (define mystr "foo") (set! mystr (string-append mystr " bar")) (displayln mystr)
- but you can create a quick macro to solve that problem
(define-syntax-rule (set-append! str value)
(set! str (string-append str value)))
(define mymacrostr "foo") (set-append! mymacrostr " bar") (displayln mystr)</lang>
- Output:
foo bar foo bar
Raku
(formerly Perl 6) <lang perl6>my $str = "foo"; $str ~= "bar"; say $str;</lang>
- Output:
foobar
Relation
<lang Relation> set a = "Hello" set b = " World" set c = a.b echo c </lang>
REXX
using abutment
<lang rexx>s='he' s=s'llo world!' Say s</lang> output
hello world!
using concatenation
<lang rexx>s="He" s=s || 'llo, World!' /*same as: s=s||'llo, World!' */ say s</lang> output
Hello, World!
Ring
<lang ring> aString1 = "Welcome to the " aString2 = "Ring Programming Language" aString3 = aString1 + aString2 see aString3 </lang>
Robotic
<lang robotic> set "$str1" to "Hello " inc "$str1" by "world!"
- "&$str1&"
end </lang>
Ruby
<lang ruby>s = "Hello wo" s += "rld" # new string object s << "!" # mutates in place, same object puts s</lang>
- Output:
Hello world!
Rust
<lang rust> use std::ops::Add;
fn main(){
let hello = String::from("Hello world"); println!("{}", hello.add("!!!!"));
}</lang>
- Output:
Hello world!!!!
Real append
The first solution doesn't append to the string variable. This solution really appends to the existing variable. <lang rust> fn main(){
let mut hello = String::from("Hello world"); hello.push_str("!!!!"); println!("{}", hello);
} </lang>
- Output:
Hello world!!!!
Scala
An evaluation in Scala worksheet. <lang scala> var d = "Hello" // Mutables are discouraged //> d : String = Hello
d += ", World!" // var contains a totally new re-instantiationed String
val s = "Hello" // Immutables are recommended //> s : String = Hello val s1 = s + s //> s1 : String = HelloHello val f2 = () => " !" //Function assigned to variable //> f2 : () => String = <function0> println(s1 + f2()); //> HelloHello !</lang>
Seed7
<lang seed7>$ include "seed7_05.s7i";
const proc: main is func
local var string: str is "12345678"; begin str &:= "9!"; writeln(str); end func;</lang>
- Output:
123456789!
Sidef
<lang ruby>var str = 'Foo'; str += 'bar'; say str;</lang>
- Output:
Foobar
SNOBOL4
<lang SNOBOL4> s = "Hello"
s = s ", World!" OUTPUT = s
END</lang>
- Output:
Hello, World!
Stata
<lang stata>sca s="Ars Longa" sca s=s+" Vita Brevis" di s
Ars Longa Vita Brevis</lang>
Swift
<lang swift>var s = "foo" // "foo" s += "bar" // "foobar" print(s) // "foobar" s.appendContentsOf("baz") // "foobarbaz" print(s) // "foobarbaz"</lang>
Tcl
String concatenation is a fundamental feature of the Tcl language, and there is also an append
that makes concatenation even simpler:
<lang tcl>set s "he"
set s "${s}llo wo"; # The braces distinguish varname from text to concatenate
append s "rld"
puts $s</lang>
- Output:
hello world
Ursa
<lang ursa>decl string str set str "hello "
- append "world" to str
set str (+ str "world")
- outputs "hello world"
out str endl console</lang>
Vala
<lang vala>void main() {
string x = "foo"; x += "bar\n"; print(x);
}</lang>
VBA
<lang VB>Function StringAppend() Dim s As String s = "foo" s = s & "bar" Debug.Print s End Function</lang>
VBScript
<lang vb>s = "Rosetta" s = s & " Code" WScript.StdOut.Write s</lang>
- Output:
Rosetta Code
Wart
<lang python>s <- "12345678" s <- (s + "9!")</lang>
Wren
<lang javascript>var s = "Hello, " s = s + "world!" System.print(s)</lang>
- Output:
Hello, world!
zkl
zkl strings are immutable, but byte blobs are mutable. <lang zkl>var s="foo"; s.append("bar"); //-->new string "foobar", var s unchanged s+="bar"; //-->new string "foobar", var s modifed to new value
s=Data(Void,"foo"); // byte blob/character blob/text editor buffer s.append("bar"); // or s+="bar" s.text; //-->"foobar"</lang>
- Programming Tasks
- Basic language learning
- String manipulation
- Basic Data Operations
- Simple
- AArch64 Assembly
- Ada
- ALGOL 68
- ARM Assembly
- Arturo
- AutoHotkey
- Avail
- AWK
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- BASIC
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- D
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- Swift
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- Wart
- Wren
- Zkl
- Bc/Omit
- Dc/Omit