CODEWITHSUNDEEP
javascriptnode.jsanonymous-function
tru7
tru7

Reputation: 7212

Set anonymous function's name

Although a Functions 'name' property is read-only, is there some trick to set it?

Here's a simplified case where it would help:

class O{
    myFn;
    constructor(fn){
        this.myFn= fn;    // Here I want to set the name of fn / this.myFn 
    }
}

new O( () => {      
    console.log("hello");  // breakpoint here the function name is "(anonymous function)"
}).myFn();

I could name it at the definition:

new O(  function namedFunction () {      
    console.log("hello");  
}).myFn();

but I am looking for a way to name/rename it later.

(I am working on node.js I am not sure if this question would be valid for browsers)

Upvotes: 2

Views: 93

Answers (1)

tru7
tru7

Reputation: 7212

Digging in Function.prototype.name docs I've found

To change it, you could use Object.defineProperty() though.

(it's at the end of the section https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#Inferred_function_names)

So this does what I wanted:

class O{
    constructor(fn){

        Object.defineProperty(fn,'name',{value:"lateNamedFunction", writable:false});

        this.myFn= fn;
    }
}

This may provide some interesting possibilities...

Upvotes: 2

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