Nice article on: JavaScript variable scope hoisting

https://www.sitepoint.com/demystifying-javascript-variable-scope-hoisting

Things to Remember

  • All declarations, both functions and variables, are hoisted to the top of the containing scope, before any part of your code is executed.
  • Functions are hoisted first, and then variables.
  • Function declarations have priority over variable declarations, but not over variable assignments.

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