Returns the first argument if it is a function (regular, async, generator, …), or your custom fallback value otherwise.
JavaScript
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The `if-fun` project is a utility module that checks if a given argument is a function (including async and generator functions) and returns it; otherwise, it returns a specified fallback value or `undefined` by default. It is designed for JavaScript developers who need a simple way to validate and handle function arguments in their code.
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