Web Reference: Jul 12, 2025 · A nested function (also known as an inner function) is a function that is declared within another function (known as the outer function). The inner function has access to the variables of its outer function, forming a lexical scope chain. Is there any way I can call the validate() function outside the initValidation() function? I've tried calling validate() but I think it's only visible inside the parent function. Dec 24, 2025 · In this guide, we’ll demystify nested functions, explore why they’re hidden by default, and walk through **5 practical methods** to call them from outside their parent.
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