How to Get the Name of the Currently Running Function in JavaScript?

Obtaining the Name of the Currently Running Function in JavaScript

In JavaScript, you may encounter situations where you require access to the name of the function that is currently being executed. While this may not be a common scenario, there are certain use cases that might necessitate this information.

Arguments.callee

In JavaScript versions prior to ES5, the arguments.callee property provided a means to retrieve the active function. However, it's important to note that this property has been deprecated in favor of safer alternatives. Using arguments.callee might lead to unexpected behavior or even errors in modern JavaScript environments.

Parsing Function Name

If you must obtain the function name, you can do so by analyzing the arguments.callee.toString() output. However, be aware that the returned string includes additional information such as curly brackets and parentheses. To extract the function name, you need to perform some parsing.

For instance:

<code class="js">function DisplayMyName() {
  var myName = arguments.callee.toString();
  myName = myName.substr('function '.length);
  myName = myName.substr(0, myName.indexOf('('));

  alert(myName);
}</code>

In ES5 and above, the arguments.callee property has been removed altogether, eliminating the ability to access the current function name directly. As a result, it's recommended to avoid relying on this feature in modern development practices.

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