How to Retrieve the Function's Name Within the Function Itself?

Determining a function's name internally can be useful for debugging or dynamic operations. To achieve this, consider the following methods:

In ES6:

• Utilizing myFunction.name to access the function name directly.

In ES5:

• Using Function.caller (non-standard and not recommended): arguments.callee.name.
• Implementing a custom function:

function functionName(fun) {
  const ret = fun.toString();
  ret = ret.substr('function '.length);
  ret = ret.substr(0, ret.indexOf('('));
  return ret;
}

• Employing a regex pattern, as suggested by nus:

/function (.{1,})\(/.exec(fun.toString())[1];

Remember that certain JavaScript minifiers may eliminate function names for better compression. Adjust the minifier's settings to prevent this if necessary.