var q = null; q++; What is q?

var x = { foo: 'A' }; x.constructor.prototype.foo = 'B'; var y = {}; console.log(x.foo); console.log(y.foo); Which two values will be logged?

What will be the result of this expression: void 0

Value of x after the following code is run? var obj = { 0: 'who', 1: 'what', 2: 'idontknow'}; var x = 1 in obj;

Value of a after executing the following: var a = [1, 2, 3]; a.splice(1, 2, 3);

What's the output? function foo(bar) { return bar ? bar == foo : foo(foo); } var result = foo();

What will be the value of a? let a = 'a'; let b = 'b'; a = [a, , b] = [1, 2, 3];

What will be returned if we call f(1);? const b = [1, 2, 3]; const f = (a, ...b) => a + b;

Why do web programmers use node.js?

Correct syntax for referring to an external script called 'test.js'?

What will be written in the alert box after executing the following code? ``` var a = 5; var b = 1; if(!!'false') { a = a + 5; b = 3; }; if(!!0) { a = a + 5; b = b + 2; }; alert(a+b); ```