fn-retriever

fn-retriever is a lightweight JavaScript utility for retrieving the name of a named function. It supports a variety of function types, including named functions, anonymous functions, arrow functions, and class methods.

Installation

You can install fn-retriever using npm:

npm install fn-retriever

Usage

Import the getFunctionName function from the fn-retriever package and use it to retrieve the name of any named function.

Example

import { getFunctionName } from "fn-retriever";

// Named function
function myFunction() {}
console.log(getFunctionName(myFunction)); // Output: 'myFunction'

// Anonymous function
const anonymousFunction = function () {};
console.log(getFunctionName(anonymousFunction)); // Output: ''

// Arrow function
const arrowFunction = () => {};
console.log(getFunctionName(arrowFunction)); // Output: ''

// Function with display name
const namedFunction = function () {};
namedFunction.displayName = "CustomName";
console.log(getFunctionName(namedFunction)); // Output: 'CustomName'

// Function assigned to a variable
const namedVariableFunction = function myNamedFunction() {};
console.log(getFunctionName(namedVariableFunction)); // Output: 'myNamedFunction'

// Class method
class MyClass {
  myMethod() {}
}
const instance = new MyClass();
console.log(getFunctionName(instance.myMethod)); // Output: 'myMethod'

// Anonymous class method
class AnotherClass {
  myMethod = function () {};
}
const anotherInstance = new AnotherClass();
console.log(getFunctionName(anotherInstance.myMethod)); // Output: ''

API

getFunctionName(fn)

Retrieves the name of a named function.

Parameters

• fn (Function): The function whose name is to be retrieved.

Returns

• string: The name of the function. Returns an empty string if the function is anonymous or if an error occurs.

Throws

• TypeError: If the argument is not a function.

Contributing

Contributions are welcome! Please feel free to submit a pull request or open an issue to improve this package.

License

This project is licensed under the MIT License. See the LICENSE file for details.