scoping in node.js with asynchronous functions
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How do JavaScript closures work?
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JavaScript asynchronous return value / assignment with jQuery
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Scoping problem?
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How do I test asynchronous Apex?
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Why aren't variables declared in "try" in scope in "catch" or "finally"?
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Event handlers inside a Javascript loop - need a closure?
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How to pass a callback as a parameter into another function
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Python lambda closure scoping
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Simplest way to wait some asynchronous tasks complete, in Javascript?
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What Scoping Class Will  Use?
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Why do you need to invoke an anonymous function on the same line?
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JavaScript Callback Scope
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How to create a scope?
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Block scope in Python
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Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference
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Calling functions with setTimeout()
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How can we return string from callback function to root function in node.js?