AI solution for JavaScript Quiz on BFE.dev
15. instanceOf

The code output by console.log will be:

object
false
number
false
false
false
true
boolean
false
false
false
true
true
true
true

Explanation:

1. typeof null outputs "object". This is a known bug in JavaScript, where typeof null returns "object" instead of "null".
2. null instanceof Object outputs false. This is because null is not an instance of any object.
3. typeof 1 outputs "number". This is because 1 is a primitive value of the number data type.
4. 1 instanceof Number outputs false. This is because 1 is a primitive value and not an instance of the Number object.
5. 1 instanceof Object outputs false. This is because 1 is a primitive value and not an instance of any object.
6. Number(1) instanceof Object outputs false. This is because Number(1) is a primitive value and not an instance of any object.
7. new Number(1) instanceof Object outputs true. This is because new Number(1) is an instance of the Number object.
8. typeof true outputs "boolean". This is because true is a primitive value of the boolean data type.
9. true instanceof Boolean outputs false. This is because true is a primitive value and not an instance of the Boolean object.
10. true instanceof Object outputs false. This is because true is a primitive value and not an instance of any object.
11. Boolean(true) instanceof Object outputs false. This is because Boolean(true) is a primitive value and not an instance of any object.
12. new Boolean(true) instanceof Object outputs true. This is because new Boolean(true) is an instance of the Boolean object.
13. [] instanceof Array outputs true. This is because [] is an instance of the Array object.
14. [] instanceof Object outputs true. This is because [] is an instance of the Object object, which is the superclass of all JavaScript objects.
15. (() => {}) instanceof Object outputs true. This is because () => {} is an instance of the Function object, which is a subclass of the Object object.