javascript interview questions and answers

javascript interview questions and answers
Questions:
1) What is TypeScript ? Does it execute in your browser? @1:47
2) Is Javascript ES6 Class is same as Java Class(classical inheritance)? Was the implementation changed in ES6? @4:25
3) undefined and “not defined” is same in Javascript? @8:19
4) “null” in Javascript ? What is difference with “undefined”? @12:28
5) What will be true in conditional Statement? @26:59