Debugging: Tools and Common Issues

tools to help debug and common issues

==> TOOLS
console.warn()
console.error()
console.table() ==> formatted table with index and value
'use strict'; ==> opts out of silen errors for scripts

Google Chrome breakpoint settings ==> click the line number to pause execution at that point and 
observe scope tab to determine what is occuring at the breakpoint

==> COMMON ISSUES
prompt() ==> will always return a string, will need to change number answers to literals using Number()

ReferenceError
==> Can be related to scoping issue
==> TDZ error: Cannot access variable before initialized

Nullish Coalesce (??)
==> will evaluate truthy if null or undefined (NOT 0 or '') or will evaluate to parameter after the ??