How Can I Access a Function\'s Name From Inside the Function in JavaScript?

Discovering Function Identity from Within

The challenge of accessing function names from within the function arises commonly in programming. With JavaScript, several approaches exist for resolving this issue.

ES6: myFunction.name

In ES6 and later versions, the direct solution is to utilize the myFunction.name property. This attribute provides the name of the function, making it an efficient and straightforward method.

ES5: Function Parsing

For ES5, a custom function named functionName(fun) can be created to extract the name from the function's string representation. It trims the "function " prefix and the parentheses, providing the desired function name.

Regex-Based Approach

Alternatively, a regular expression can be employed to obtain the function name. The following regex-based function by nus offers enhanced performance:

<code class="javascript">function funName(fun) {
  return fun.toString().match(/function ([^\(]+)[\s\S]*/)[1];
}</code>

Cautions and Considerations

It's important to note that minifiers may optimize away function names for improved compression. If this poses an issue, you may need to adjust your minifier settings. Additionally, Function.caller and arguments.callee should be avoided as they are non-standard and discouraged in strict mode.

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