1)[1,2]+[3,4]

2)var a=10;

function b(){
console.log(a);
var a=20
}
b();

3)Lambda size and how to use in s3

4)promise or next tick console setimeediate

5)profit problem

6)context vs event

7) NaN===NaN

8)layers in lambda

9)TTL in sqs, visibility timeout,default time

10)lambda size,defualt time

11)Can lambda trigger sns or viceversa

12)corre modules in nodejs