Chained Variable Declarations

    (function f1() {
        var a = 1, 
            b = 1;
        var x = y = 2;  // no var is applied to y!, 
                        // so JS assigns the variable to the next upper scope (global scope)
    })();
    (function f2() {
        let j = 1, 
            k = 1;
        let r = s = 2;  // no let is applied to s!
                        // so JS assigns the variable to the next upper scope (global scope)
    })();
    
    //what are the values for a, b, x, y, j, k, r, s in the global scope?
    //which of these variables will exist on the window/global object?
    //var is function scoped, let is block scoped
    console.log(global.s);