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Idiom #214 Pad string on the right

Append extra character c at the end of string s to make sure its length is at least m.
The length is the number of characters, not the number of bytes.

while (s.length() < m) s = s + c;
s = s.PadRight(m, c);
s = s.padRight(m, c);
That's automatically the way strings are handled, as specified by the Fortran language standard.
CHARACTER(N) ::  FOO

import "strings"
import "utf8"
if n := utf8.RuneCountInString(s); n < m {
	s += strings.Repeat(c, m-n)
}
s = s.padEnd(m, c);
uses LazUtf8;
s := UTF8PadRight(s,m,c);
$s .= $c x ($m - length $s)

$s = length($s) >= $m ? $s : $s . $c x ( $m-length($s) );

s = s.ljust(m, c)
s = f'{s:{c}<{m}}'
s = s.ljust(m, c)
use pad::PadStr;
let out = s.pad_to_width_with_char(m, c);
New implementation...
< > ⌨
programming-idioms.org 
while (s.length() < m) s = s + c;
s = s.PadRight(m, c);
s = s.padRight(m, c);
CHARACTER(N) ::  FOO

if n := utf8.RuneCountInString(s); n < m {
	s += strings.Repeat(c, m-n)
}
s = s.padEnd(m, c);
s := UTF8PadRight(s,m,c);
$s .= $c x ($m - length $s)

$s = length($s) >= $m ? $s : $s . $c x ( $m-length($s) );

s = s.ljust(m, c)
s = f'{s:{c}<{m}}'
s = s.ljust(m, c)
let out = s.pad_to_width_with_char(m, c);