Search for function name ( Javascript )

Question

Good day,

Is there any alternative to arguments.callee.toString().match to find a function name ? Like make another function with a loop that will search for the name.

All my functions are named :

function mthdSearch() {
    console.log("test0")
};

function funkA() {
    console.log("test1");
}


function funkB() {
    console.log("test2");
}

Try to put all of them to an object and use Object.getOwnPropertyNames() — Tân
– Tân, Commented Jan 19, 2017 at 10:37
What exactly do you want to achieve? Take note, that arguments.callee is deprecated and removed in strict mode: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… — Kuba Wyrostek
– Kuba Wyrostek, Commented Jan 19, 2017 at 10:38
You should be more specific about what you want to do. Do you want to test if a function for a given name exists? In this case—and in case there is a global object—globally declared functions are accessible from the global object. I.e. function f() {console.log("call to 'f'");} will be accessible on the window object (window.f() will result in a print to the console). — FK82
– FK82, Commented Jan 19, 2017 at 10:39
@FK82 , i'm a newbie in our company and i was given a task to find out if it is possible to search for function names and lets say write them in console.log . I have found arguments.callee , but u have to write it in each function ? And as Kuba told , it is deprecated in strict mode. — Kirill Vorobjov
– Kirill Vorobjov, Commented Jan 19, 2017 at 10:55
@KirillVorobjov From a general perspective, this is impossible because of scope. This is a counter example: jsfiddle.net/fqb8ukz5 . As you can see, if you are outside of the scope of the anonymous function, you cannot access the functions named f and h and thus cannot access their names. — FK82
– FK82, Commented Jan 19, 2017 at 11:58

FK82 · Accepted Answer · 2017-01-19 12:32:54Z

As stated in my comment, this is impossible from a general perspective.

You can construct a counter example by declaring functions locally (i.e. within local scope) of another function and then try to access the declared functions by name outside of the scope of that function:

(function() {
	function f() {console.log("f")}
 	var g = function g() {console.log("g");};
 	h = function h() {console.log("h");};
  f();
  g();
  h();
})();

try {f();}
catch(e) {console.log(e.message);}

try {g();}
catch(e) {console.log(e.message);}

try {h();}
catch(e) {console.log(e.message);}

As you can see, only h is accessible outside of the scope of the anonymous function, because it was declared globally (by omitting the var keyword).

If you're looking for a technique to store a collection of functions and access them by name, use an object oriented JavaScript pattern (MDN introduction to object oriented JavaScript).

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