Comments on: Fat Arrow Functions in JavaScript

By: Francis Kim

Francis Kim — Tue, 19 Jan 2016 01:15:33 +0000

Ahead of time this post was

By: CoDEmanX

CoDEmanX — Thu, 29 Jan 2015 18:29:27 +0000

@rob: nice trick using “new”, but it can have side-effects. What about fn.hasOwnProperty(“prototype”) though? Apparently working in Firefox and iojs with –harmony_arraow_functions.

By: rob

rob — Sat, 23 Nov 2013 17:47:06 +0000

In reply to Angelos Sphyris.

right you are! I’ve fixed it.

(we just proved Open Source works) 🙂

By: Angelos Sphyris

Angelos Sphyris — Fri, 15 Nov 2013 19:12:56 +0000

There is a slight error in your definition of fib

let fib = (n) => {
if (n <= 1) return 1;
return fib(n – 1) + fib(n – 2};
}

You need to enclose n-2 in parentheses not a left parenthesis and a right curly brace.

By: Jordan Harband (@ljharb)

Jordan Harband (@ljharb) — Tue, 08 Oct 2013 07:15:19 +0000

I’ve written an npm module to detect if something is an arrow function or not – https://npmjs.org/package/is-arrow-function – it only works in Firefox at the moment, but will work in any runtime that supports arrow functions going forward!

By: rob

rob — Fri, 27 Sep 2013 13:33:49 +0000

ix, no good reason. 🙂

By: ix

ix — Fri, 27 Sep 2013 08:32:28 +0000

A side-question, but why are you not using event.target directly in your function? Why the extra temporary value?

By: Šime Vidas

Šime Vidas — Mon, 23 Sep 2013 23:22:11 +0000

My mistake, I meant this: ᐸscript type=”text/javascript;version=1.8″ᐳ

By: rob

rob — Mon, 23 Sep 2013 23:07:32 +0000

In reply to Šime Vidas. that's really an issue with jsFiddle, not Firefox. If you run your example code directly in a Scratchpad or the Console it will work.

By: Šime Vidas

Šime Vidas — Mon, 23 Sep 2013 23:05:10 +0000

So, for the “let” statement to work, the code has to be placed in a script element with a type attribute that contains the “language” value, e.g. . On the other hand, arrow functions work in regular blocks. This should be noted in the article, since some people may try to test that code in their Firefox.