Getting Started With ES2015
Defining Variables With let and const
Creating Unchanging Variables With const
does this essentially get rid of the headaches with all that global/local scope stuff?
All variables have scope that depends on where they are declared. But those declared with "var" have function scope, and those declared with "const" or "let" have block scope.
There are other differences as well. See the MDN pages on var, const and let for more details.
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