7567     $def(self, '$center', function $$center(width, padstr) {  argument
7571       if (padstr == null) padstr = " ";
7573       padstr = ($coerce_to(padstr, $$$('String'), 'to_str')).$to_s();
7574       if ($truthy(padstr['$empty?']())) {
7581       var ljustified = self.$ljust($rb_divide($rb_plus(width, self.length), 2).$ceil(), padstr),
7582           rjustified = self.$rjust($rb_divide($rb_plus(width, self.length), 2).$floor(), padstr);
8056     $def(self, '$ljust', function $$ljust(width, padstr) {  argument
8060       if (padstr == null) padstr = " ";
8062       padstr = ($coerce_to(padstr, $$$('String'), 'to_str')).$to_s();
8063       if ($truthy(padstr['$empty?']())) {
8076         result += padstr;
8343     $def(self, '$rjust', function $$rjust(width, padstr) {  argument
8347       if (padstr == null) padstr = " ";
8349       padstr = ($coerce_to(padstr, $$$('String'), 'to_str')).$to_s();
8350       if ($truthy(padstr['$empty?']())) {
8358           patterns  = Math.floor(chars / padstr.length),
8359           result    = Array(patterns + 1).join(padstr),
8362       return result + padstr.slice(0, remaining) + self;