in response to recent nodejs post

throw-errors.js

// In response to this idiom
// (code copied from https://groups.google.com/d/topic/nodejs/wzSUdkPICWg/discussion):

mainWindow.menu("File", function(err, file) {
 if (err) throw err;
 file.openMenu(function(err, menu) {
   if (err) throw err;
   menu.item("Open", function(err, item) {
     if (err) throw err;
     item.click(function(err) {
       if (err) throw err;
       mainWindow.getChild(type('Window'), function(err, dialog) {
         if (err) throw err;
         //...
       });
     });
   });
 });
});

// Here's a little helper function that simplifies that `if (err) throw err;` noise:

var throwErrors = function( fn ) {
    return function( err, args ) {
        if ( err ) throw err;
        return fn.apply( this, Array.prototype.slice.call( arguments, 1 ));
    };
}

mainWindow.menu( "File", throwErrors( function( file ) {
 file.openMenu( throwErrors( function( menu ) {
   menu.item( "Open", throwErrors( function( item ) {
     item.click( throwErrors( function() {
       mainWindow.getChild( type( 'Window' ), throwErrors( function( dialog ) {
         //...
       }));
     }));
   }));
 }));
}));