3rd-eden / fn.name

Extract the name from a function.

fn.name

Extract the name of a given function. Nothing more than that.

Installation

This module is compatible with Browserify and Node.js and can be installed using:

npm install --save fn.name

Usage

Using this module is super simple, it exposes the function directly on the exports so it can be required as followed:

'use strict';

var name = require('fn.name');

Now that we have the name function we can pass it functions:

console.log(name(function foo() {})) // foo

And that's it folks!

License

MIT

fn.name's Issues

support for arrow functions (incorrect currently)

currently it works only for arrow functions that don't have arguments/params

var fnName = require('fn.name')

console.log(fnName(() => 123)) // => anonymous
console.log(fnName(() => {return 123})) // => anonymous
console.log(fnName((a, b, c) => a + b + c)) // => a, b, c
console.log(fnName((a, b) => {return a + b})) // => a, b

Why no check for null?

@3rd-Eden Curious, curious, what is the reason this heavily-used module/function throws when fn === null ?

Perhaps in the past this was handled, but doing this extra check reduces performance etc.?
Or is it to be flow-agnostic, AKA let the calling dev decide how to handle the uncaught TypeError that is thrown?

https://github.com/3rd-Eden/fn.name/blob/master/index.js#L22C3-L24C22

//
  // Check to see if the constructor has a name.
  //
  if (
       'object' === typeof fn
    && fn.constructor // this will throw when fn === null
    && 'string' === typeof fn.constructor.name
  ) return fn.constructor.name;