Why a Name Function Expression not available outside function body [duplicate]

Answer 1

No, the function is not a named function, it's a function expression.

A function expression can optionally have a name. Ref:

function [name]([param1[, param2[, ..., paramN]]]) {
   statements
}

Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/function

About the function name:

name
The function name. Can be omitted, in which case the function is anonymous. The name is only local to the function body.

(Emphasis mine.)

A named function has a very similar syntax, but it's a declaration, not an expression.