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How do JavaScript closures work?

javascriptvariablesclosuresfunctionscope
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What is the scope of variables in JavaScript?

javascriptvariablesfunctionscopevar
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Reference: What is variable scope, which variables are accessible from where and what are "undefined variable" errors?

phpscope
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Using global variables in a function

pythonscopeglobal-variables
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Short description of the scoping rules?

pythonscopedynamic-languages
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android-multidexemail-addressangular2-routingpreg-matchfloating-accuracyandroid-arrayadaptermallocgit-refspecxml-validationhibernateuninstallationanonymous-functioncheckedexponentiationhyperlinkregex-greedydatatableundefined-indexclientidlocal-variables