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repeat
Combined from primary sources listed below.

In Control flow§

See primary documentation in context for repeat/while, repeat/until

Executes the block at least once and, if the condition allows, repeats that execution. This differs from while/until in that the condition is evaluated at the end of the loop, even if it appears at the front.

my $x = -42;
repeat {
    $x++;
} while $x < 5;
$x.say; # OUTPUT: «5␤» 
 
repeat {
    $x++;
} while $x < 5;
$x.say; # OUTPUT: «6␤» 
 
repeat while $x < 10 {
    $x++;
}
$x.say; # OUTPUT: «10␤» 
 
repeat while $x < 10 {
    $x++;
}
$x.say; # OUTPUT: «11␤» 
 
repeat {
    $x++;
} until $x >= 15;
$x.say; # OUTPUT: «15␤» 
 
repeat {
    $x++;
} until $x >= 15;
$x.say; # OUTPUT: «16␤» 
 
repeat until $x >= 20 {
    $x++;
}
$x.say; # OUTPUT: «20␤» 
 
repeat until $x >= 20 {
    $x++;
}
$x.say; # OUTPUT: «21␤»

All these forms may produce a return value the same way loop does.