// JavaScript Document

function sprintf() {
 if( sprintf.arguments.length < 2 ) {
  return;
 }
 
 var data = sprintf.arguments[ 0 ];
 
 for( var k=1; k<sprintf.arguments.length; ++k ) {
 
  switch( typeof( sprintf.arguments[ k ] ) )
  {
   case 'string':
    data = data.replace( /%s/, sprintf.arguments[ k ] );
    break;
   case 'number':
    data = data.replace( /%d/, sprintf.arguments[ k ] );
    break;
   case 'boolean':
    data = data.replace( /%b/, sprintf.arguments[ k ] ? 'true' : 'false' );
    break;
   default:
    /// function | object | undefined
    break;
  }
 }
 return( data );
}
 
if( !String.sprintf ) {
 String.sprintf = sprintf;
}