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Why is a Closure a necessity in functional programming?

Why is a Closure a necessity in functional programming?
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Why is a Closure a necessity in functional programming?

User Pedrofalcaocosta
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Closures are a necessity in functional programming because they allow you to associate data (the lexical environment) with a function that operates on that data. (closures are the way the languages can achieve lexically scoped name binding)
User Damian Green
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