user
Task

Create a string variable equal to any text value.

Prepend the string variable with another string literal.

If your language supports any idiomatic ways to do this without referring to the variable twice in one expression, include such solutions.

To illustrate the operation, show the content of the variable.
assistant
(formerly Perl 6)

```
# explicit concatentation
$_ = 'byte';
$_ = 'kilo' ~ $_;
.say;

# interpolation as concatenation
$_ = 'buck';
$_ = "mega$_";
.say;

# lvalue substr
$_ = 'bit';
substr-rw($_,0,0) = 'nano';
.say;

# regex substitution
$_ = 'fortnight';
s[^] = 'micro';
.say;

# reversed append assignment
$_ = 'cooper'; 
$_ [R~]= 'mini';
.say;

```

Output:

```
kilobyte
megabuck
nanobit
microfortnight
minicooper
```