Fun quiz!!!

quiz-3-1.js

let a = {
  x: 1,
  getX: function() {
    return this.x;
  }  
};

let b = Object.create(a);
b.x = 10;

delete b.x;
console.log(b.getX());
// What will console print ?

quiz-3-2.js

let a = [1, 'a', {x : 1}, {y : 2}, [1, 2], {x : 1}];
console.log(a.indexOf({x : 1}));
// What will console print ?

quiz-3-3.js

(function() {
  var x = y = 10;
})();
console.log(y);
// What will console print ?

quiz-3-4.js

let a = [1, 2, 3];
a[-1] = 4;
a[10] = 5;

console.log(a[6], a.length);
// What will console print ?

quiz-3-5.js

let a = {},
    b = {x: 12},
    c = [1, 2],
    d = {m: 'a', n: 'b'};

a[b] = 34;
a[c] = 56;
a[d] = 78;

console.log(a[b], a[c], a[d]);
// What will console print ?

quiz-3-6.js

var x = (x = 0, x++, x);
let y = (y = 0, y++, y); 
console.log(x, y);
// What will console print ?