what scope does a function set to let have?

Question

let as opposed to var is scoped more tightly than var but I was wondering if it changes the scoping of anonymous functions?

Example:

class Foo {
    method1() {
        var scopelessFunc = this.method2;

        // executed in global scope
        scopelessFunc();

        let differentScope = this.method2;

        // what scope is this executed in?  (what does method2 output)
        differentScope();
    }

    method2() {
        console.log(this);
    }
}

NOTE: as of today jan 14 to my knowledge let is not fully supported anywhere so I can not go and test this myself.

Answer 1

You're mixing up two concepts which have nothing to do with one another. Variable scoping via let and var just influences the visibility of those variables. The magic keyword this is a completely separate mechanism. What this refers to depends on how the function was invoked. Both scopelessFunc() and differentScope() invoke the function in exactly the same way, so there's no difference. If you want to make a difference, you need to change the way you call them:

someObj.scopelessFunc()
scopelessFunc.apply(someObj)

That's the only thing that influences this, and it doesn't matter whether someObj or scopelessFunc where defined via var or let.