How do I expose data from within ES6 blocks?

Question

ES6 has introduced block scopes using let and const . What's the correct way to export data from within the block scope, so that I can access it from outside. Using IIFE you could just assign a the expression to a variable.

{
   const add = (a, b) => a+b
   // export add?
}

Using export within the block throws an error.

'import' and 'export' may only appear at the top level

One way I've found is to assign it to the global window object

{
   const add = (a, b) => a+b
   window.add = add
}

I'm just curious to know what the suggested way to do this is?

Answer 1

Create a function, and return the value you need.

 const Add = () => { return 'function add returned...'; }; 

Answer 2

You can also create a variable outside of the block and just assign it a value inside the block.

let myVar;

const myFunc = () => {
    myVar = 'foo';
};