How to explain such problem solving?

Question

JavaScript

Why is the response NaN in the expression: [ ] + false - null + true ?
Why is the sum of the expression [ ] + 1 + 2 equal to 12?
alert( "1"[0] ) prints 1
Why does "hedgehog" > "apple" print true?

Answer 1

As you begin to learn the language and get to type casting, you will find your answers.

Answer 2

This and other articles that are Googled for "type casting in JavaScript"