Meeting Notes 4

notes4.md

Meeting notes

• Module pattern is very common. Old way of wrapping with a function, new way of export/import
• Module pattern is something many frameworks have been using for a long time.
• A really useful pattern since in JS we don't have access modifiers
• What about module ___ from 'module' ? I think it's actually import * as module from 'module'
• What about multiple exports in a single file? I think this is legal
• this keyword -- the four rules.
  • new keyword
  • explicit
  • implicit
  • default
• let vs var -- let defines a new copy of the var inside a for-loop, solving the issue of setTimeout all using same var
• Hoisting is something we were doing as a matter of principal to keep our code-base clean -- we didn't know about the consequences of not
• Exercises were very useful to show what was going on -- function declarations over expressions
• Returning a function from an iife is a handy way of running it at the end
• reviewing the new keyword and the things that occur there, how it makes a function into a constructor call
  • An empty object is created
  • The empty object gets linked to a different object
  • empty object gets bound as this for the purpose of the function call
  • if the function does not otherwise return anything, new will insert return this
• Closures -- a function that remembers its scope even when its executed somewhere else
  • happens when an outer function returns an inner function
• Closures -- we all use them, but understanding them in a bit more detail allows us to write higher quality code