Another way to call a function without parentheses is with an ES5 getter (or ES6 proxy):

    // The function we want to call
    function foo () { console.log('Hello!') }

    // ES5 getter:
    x = {}
    Object.defineProperty(x, 'foo', {get: foo})

    // Call it:
    x.foo               // Outputs 'Hello!'

What if we want to say "foo" instead of "x.foo"? Put a getter on window:

    Object.defineProperty(window, 'bar', {get: foo})

    // Call it:
    bar                 // Outputs "Hello!"

To pass arguments, use a setter instead:

    Object.defineProperty(window, 'hello', {set:
        function (x) {console.log('Hello '+x+'!')}
    })

    // Call it:
    hello = 'michael'   // Outputs "Hello michael!'

To support multiple arguments, pass an array or hash.