Which Object method takes a `propertyName` parameter and returns `true` if the object contains an uninherited property with that key?

Difference between using call() and apply() to invoke a function with multiple arguments?

What's the output? if ('foo') { console.log('foo' === false); console.log('foo' === true); }

Right way to combine two arrays into a new array? var a = ['a', 'b', 'c']; var b = ['d', 'e', 'f'];

function b(x, y, a) { arguments[2] = 10; alert(a); } b(1, 2, 3); What is alerted?

A javascript variable prefixed with a $ is:

A closure is a function defined inside another and has access to the variable which is declared and defined in parent function scope?

Correct way to create an Object

Which statement is True for Behavioral design patterns?

What does the following line of code do?

What value is returned when a Confirm box is cancelled?