JavaScript - Declaring Global Scope for Nested Function?

Question

My attempts at giving global scope to a nested JavaScript function are not working:

//DECLARE FUNCTION B IN GLOBAL SCOPE
function B;

function A() {

    //DEFIN         


        

Answer 1

There appear to be a couple of issues with your code

1. The first line doesn't appear to be legal Javascript (JSLint agrees). To declare an uninitialized variable use the var B; syntax
2. The code never calls A to initialize B so calling B() is invoking an uninitialized variable
3. I'm fairly certain the code to initialize B inside of A is also not legal.

Try the following

var B; // Establish B as a global scope variable

function A() {
  B = function() {
    alert('B is running');
  };
}

A(); // Call the function which will cause B to be initialized
B(); // Run B