Execute multiple functions where one is expected. Useful for event handling.

multi.js

function multi(){
	var handlers = Array.prototype.filter.call( arguments, function( x ){
		return x instanceof Function 
	} )
	
	return function handle(){
		for( var i = 0; i < handlers.length; i++ )
			handlers[ i ].apply( this, arguments )
	}
}

Use case:

m( 'form', {
    onkeypress : multi(
        onKey( 'enter', ctrl.save ),
        onKey( 'esc',   ctrl.delete )
    )
}, content );

onKey function here

An alternative name for this function is doAll