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Programming-Idioms

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  • Rust

Idiom #289 Concatenate two strings

Create the string s by concatenating the strings a and b.

let s = format!("{}{}", a, b);

This allocates a new String with a and b concatenated.
let s = a + b;

This adds b to the current allocation of a, meaning that a needs to be a mutable String.
S : constant String := A & B;
New implementation...
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programming-idioms.org 
let s = format!("{}{}", a, b);
let s = a + b;
S : constant String := A & B;
(def s (str a b))
std::string a{"Hello"};
std::string b{"world"};
auto s = a + b;

string s = String.Concat(a,b);
string s = a + b;
var s = a + b;
var s = '$a$b';
s = a <> b
s = a // b
s := a + b
s = a <> b
s = a ++ b
const s = a + b;
String s = "%s%s".formatted(a, b);
String s = a.concat(b);
String s = a + b;
StringBuilder t = new StringBuilder(a);
Formatter f = new Formatter(t);
f.format("%s", b).flush();
String s = t.toString();
val s = a + b
local s = a..b
$s = $a.$b;
s := a + b;
my $s = $a . $b;
s = a + b
s = f'{a}{b}'
s = a + b
s = a & b