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WK5 D4

Topics

  • closures
  • es6

Closures

  • function scope

  • every code block creates an execution context (restricted area where code block can exec)

  • whenever a function is created, a brand new exec context is created, it may be

    • global context (can be accessed from everywhere)
    • local context (can be accessed only from own code block)

  • any code which the script doesn't specifically start up as a background task has a Window as its global object

  • windows is global context area

  • closure

    • returns a function
    • variable are stored and not get deleted even after invoking