Recently, I came across this interesting piece of code:
function getFuncName() {
return getFuncName.caller.name
}
I'm curious to understand the concept behind using getFuncName within the getFuncName function. Can someone provide an explanation or point me to a reliable source like MDN web docs?
The basic idea behind the following code is to retrieve the name of the function that called a specific function: window.getFuncName.caller.name.
By using the global name of the function, you are able to request the name of the function that invoked it.
It's worth noting that relying on the caller property or the callee property is discouraged.
function whoCalledMe() {
return window.whoCalledMe.caller.name;
}
function iCalledYou() {
console.log(whoCalledMe());
}
iCalledYou();Discover the getFuncName() method which reveals the name of the function that invoked it.
Encountering challenges when trying to retrieve getFuncName.caller.name? Exploring an alternative approach may be necessary.
To unveil the identity of the function triggering getFuncName, consider passing the function itself as a parameter
function fetchCallerName(func) {
return func.name;
}
function myFunction() {
console.log(fetchCallerName(myFunction));
}
myFunction(); // Result: "myFunction"
Here is where you can find the documentation:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/caller
It seems like using caller is considered legacy code and should be avoided in new implementations.
Sometimes it may be necessary to get a function's caller, in which case an error stack could be used as an alternative.
You can also retrieve the function itself by evaluating its name with eval() if it is accessible from the current scope.
'use strict';
function whoCalledMe() {
try{
throw new Error();
}catch(e){
return e.stack.split('\n')[2].match(/\w+(?=\s*\()/)[0];
}
}
function iCalledYou() {
console.log(whoCalledMe());
}
iCalledYou();Hopefully, this provides the solution you were seeking-
In essence, your code retrieves the name of the calling function-
function getCallerName(){
console.log(fetchFunctionName())
}
The result of running this code will be "getCallerName".
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