This video describe about clousures very details.
also it describe following things.
what is Closures?
What is nested fucntion?
What are the types of scope available for fucntion?
What are the types of scope available for closure?
What is legxical scope?
How to maintan state in function?
How to create private function and variables?
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closures,
Javascript closure function,
gloabal scope,
local scope,
legxical scope,
nested function,
javascript scope,
function state,
statefull function,
javascript private member,
private variable,
private function