What happens when JavaScript variable name and function name is the same?

Question

I have the following code, where I declare a function and after it, a variable with the same name as the function:

function a(x) {
    return x * 2;
}

var a         


        

Answer 1

ES6 comes with a better solution by defining SyntaxError: Identifier (?) has already been declared when using let / const instead of var.

let

function foo () {}
let foo;
// => SyntaxError: Identifier 'foo' has already been declared

const

function foo () {}
const foo = 1;
// => SyntaxError: Identifier 'foo' has already been declared

Note that const foo; does not work. It will cause SyntaxError: Missing initializer in const declaration