Does NetBeans\' Suggestion of Return Values for JavaScript Functions Hold True?

Does Every JavaScript Function Mandate a Return Value?

As Netbeans prompts the inclusion of "@returns {type}" in JavaScript function comments, it raises the question: does every JavaScript function necessitate a return value?

Unveiling the Truths

Contrary to Netbeans' suggestion, no, JavaScript functions do not inherently require a return value. Nevertheless, the JavaScript engine demands notification of a function's completion, achieved through the function returning a value.

Implicit Returns: The Undefined Path

In the absence of an explicit return statement, JavaScript functions default to returning undefined, analogous to the void return type in C . This behavior mirrors the seamless integration of undefined return values in most programming languages.

Ignoring Return Values: A Common Practice

JavaScript grants the freedom to disregard return values, a practice prevalent throughout the language. This behavior emphasizes the focus on the statements' execution rather than the value returned, as exemplified by IIFEs.

The Underlying Function

At its lowest level, a return essentially translates into a jump instruction. Without returning anything, the engine lacks direction on what to execute next, potentially inhibiting essential functions such as event handling.

In Summary:

While your code may operate without explicitly returning values, the JavaScript engine interprets every function as returning something. If absent, the engine assigns the undefined value by default. Thus, while Netbeans suggests a consistent commenting scheme, it's important to recognize that not all JavaScript functions explicitly return values.

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