Build a function object with properties in TypeScript

Question

I want to create a function object, which also has some properties held on it. For example in JavaScript I would do:

var f = function() { }
f.someValue = 3;
         


        

Answer 1

As a shortcut, you can dynamically assign the object value using the ['property'] accessor:

var f = function() { }
f['someValue'] = 3;

This bypasses the type checking. However, it is pretty safe because you have to intentionally access the property the same way:

var val = f.someValue; // This won't work
var val = f['someValue']; // Yeah, I meant to do that

However, if you really want the type checking for the property value, this won't work.