What is the reasoning behind the decision for the javascript void statement to assess an expression?

When it comes to the javascript void statement, it is designed to evaluate an expression and yield the value of undefined. The concept behind this functionality stems from the fact that the global variable undefined can be altered. However, one might wonder why an expression needs to be evaluated at all. Interestingly, many individuals simply utilize 0 in their code, such as in the examples below:

void 0;
void(0);

In exploring Raghu's response, it becomes evident that according to the documentation, the purpose of this operator is to enable the integration of expressions with side effects into scenarios where a result of undefined is required.

This operator facilitates the inclusion of expressions that trigger side effects within contexts necessitating the evaluation of values resulting in undefined.

The question arises - are there instances wherein placing void(0) in the exact location requiring an outcome of undefined proves insufficient? Could there be situations demanding the assessment of expressions with side effects on separate lines instead?

Answer №1

One of the primary purposes of the void operator is to prevent navigation when clicking on links with a javascript: URL. By using this operator, you can ensure that no navigation occurs when the javascript function returns undefined. The void operator is commonly used for this purpose due to its simplicity.

For example:

<a href="javascript: void console.log('click') ">log click to console</a>

or in a more general context:

<a href="javascript: void doSomething() ">do something</a>

This concept can be demonstrated in this JavaScript fiddle.

Answer №2

Exploring the standard documentation can provide insights into why certain expressions are evaluated and shed light on common use cases

Visit this link for more information

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