Javascript Hosting

hosting.js

function abc() {
    console.log('Calling pr');
    pr();
    console.log('calling pr2');
    pr2();
    console.log('checking a ');
    console.log(a);
    var a;
    console.log(a);
    var d = 5;
    console.log('calling non-existing param c ');
    console.log(c);
    function pr() {
        console.log('pr function');
    }
    var pr2 = function () {
        console.log('pr2 function');
    };
}
abc();