What is the difference between a closure and an anonymous function in JavaScript
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The closure mechanism applies to all JavaScript functions, whether anonymous or not.
I think confusion between the two concepts comes from use of the term “closure” where an author has said something like “the following code creates a closure” and then given an example that happens to use an anonymous function. In such instances typically the closure mechanism is what is important to make the particular piece of code work as intended, while use of an anonymous function rather than a named function just happens to be a convenient way to code it. People reading such examples and seeing “closure” for the first time then misinterpret the term and go on to use it incorrectly in their own Stack Overflow or blog posts and so the confusion spreads.