How to convert an “object” into a function in JavaScript?

Question

JavaScript allows functions to be treated as objects--if you first define a variable as a function, you can subsequently add properties to that function. How do you do the

Answer 1

JavaScript allows functions to be treated as objects--you can add a property to a function. How do you do the reverse, and add a function to an object?

You appear to be a bit confused. Functions, in JavaScript, are objects. And variables are variable. You wouldn't expect this to work:

var three = 3;
three = 4;
assert(three === 3);

...so why would you expect that assigning a function to your variable would somehow preserve its previous value? Perhaps some annotations will clarify things for you:

// assigns an anonymous function to the variable "foo"
var foo = function() { return 1; }; 
// assigns a string to the property "baz" on the object 
// referenced by "foo" (which, in this case, happens to be a function)
foo.baz = "qqqq";