Which of the following String prototype method takes a regular expression?

What's the output? console.log(1 + '1' - 1);

Evaluate: '10' - (17).toString()

True or false ? typeof(null) == typeof(undefined)

What will: typeof typeof(null) return?

Evaluate: undefined + 2

Which code will create the Boolean object with an initial value of true?

Which will change the color of a paragraph’s text to blue when a user hovers over it, and reset it back to black when the user hovers out?

The following are sample codes on how to merge properties of two JavaScript objects dynamically: var objl = { food: var obj2 = { animal: 'dog' }

What's the output? (function() { var objl = new Object({name: 'Jacob'}); var obj2 = new Object({name: 'Alex'}); console.log(objl == obj2); console.log(objl === obj2);

What method can't be used with a window object?