javascriptScope errorHard

Hoisted var shadows the value you wanted

Time: 0:00

What it should do

describe(useLocal) should return "local" when useLocal is true and the outer "global" when it is false.

What goes wrong

describe(false) throws "Cannot access 'label' before initialization" instead of returning "global".

Hints

This is a scope and closure bugs bug

Every callback reports the last value, a counter never increments, UnboundLocalError on a variable you can see.