ENenitihas·Mar 31, 2016
In A Python-to-JavaScript Transpiler with BabelJS and SourceMapsatsepkov
RapydScript
JavaScript2014–2016
atsepkov / RapydScript
RapydScript
Python-inspired, decluttered JavaScript
4Distinct people
4Mentions
0Explicit recommenders
690GitHub stars
What to know before exploring
What it is
Python-inspired, decluttered JavaScript
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
No recommendation phrase was found in the indexed comments.
No classified warning is attached to this page. Read the discussions before treating silence as approval.
Also in these discussions
No other repository is repeatedly linked in the same discussions.
This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 1:49:46 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by month4 dated mentions
Observed mentions: 2014-01-02 11:12:50 UTC to 2016-03-31 13:16:06 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| Jan 2014 | 2014-01-01 00:00:00 UTC | 2014-02-01 00:00:00 UTC | 1 | 1 | 0 |
| Feb 2014 | 2014-02-01 00:00:00 UTC | 2014-03-01 00:00:00 UTC | 0 | 0 | 0 |
| Mar 2014 | 2014-03-01 00:00:00 UTC | 2014-04-01 00:00:00 UTC | 0 | 0 | 0 |
| Apr 2014 | 2014-04-01 00:00:00 UTC | 2014-05-01 00:00:00 UTC | 0 | 0 | 0 |
| May 2014 | 2014-05-01 00:00:00 UTC | 2014-06-01 00:00:00 UTC | 0 | 0 | 0 |
| Jun 2014 | 2014-06-01 00:00:00 UTC | 2014-07-01 00:00:00 UTC | 1 | 0 | 1 |
| Jul 2014 | 2014-07-01 00:00:00 UTC | 2014-08-01 00:00:00 UTC | 0 | 0 | 0 |
| Aug 2014 | 2014-08-01 00:00:00 UTC | 2014-09-01 00:00:00 UTC | 0 | 0 | 0 |
| Sep 2014 | 2014-09-01 00:00:00 UTC | 2014-10-01 00:00:00 UTC | 0 | 0 | 0 |
| Oct 2014 | 2014-10-01 00:00:00 UTC | 2014-11-01 00:00:00 UTC | 0 | 0 | 0 |
| Nov 2014 | 2014-11-01 00:00:00 UTC | 2014-12-01 00:00:00 UTC | 0 | 0 | 0 |
| Dec 2014 | 2014-12-01 00:00:00 UTC | 2015-01-01 00:00:00 UTC | 0 | 0 | 0 |
| Jan 2015 | 2015-01-01 00:00:00 UTC | 2015-02-01 00:00:00 UTC | 0 | 0 | 0 |
| Feb 2015 | 2015-02-01 00:00:00 UTC | 2015-03-01 00:00:00 UTC | 0 | 0 | 0 |
| Mar 2015 | 2015-03-01 00:00:00 UTC | 2015-04-01 00:00:00 UTC | 0 | 0 | 0 |
| Apr 2015 | 2015-04-01 00:00:00 UTC | 2015-05-01 00:00:00 UTC | 1 | 0 | 1 |
| May 2015 | 2015-05-01 00:00:00 UTC | 2015-06-01 00:00:00 UTC | 0 | 0 | 0 |
| Jun 2015 | 2015-06-01 00:00:00 UTC | 2015-07-01 00:00:00 UTC | 0 | 0 | 0 |
| Jul 2015 | 2015-07-01 00:00:00 UTC | 2015-08-01 00:00:00 UTC | 0 | 0 | 0 |
| Aug 2015 | 2015-08-01 00:00:00 UTC | 2015-09-01 00:00:00 UTC | 0 | 0 | 0 |
| Sep 2015 | 2015-09-01 00:00:00 UTC | 2015-10-01 00:00:00 UTC | 0 | 0 | 0 |
| Oct 2015 | 2015-10-01 00:00:00 UTC | 2015-11-01 00:00:00 UTC | 0 | 0 | 0 |
| Nov 2015 | 2015-11-01 00:00:00 UTC | 2015-12-01 00:00:00 UTC | 0 | 0 | 0 |
| Dec 2015 | 2015-12-01 00:00:00 UTC | 2016-01-01 00:00:00 UTC | 0 | 0 | 0 |
| Jan 2016 | 2016-01-01 00:00:00 UTC | 2016-02-01 00:00:00 UTC | 0 | 0 | 0 |
| Feb 2016 | 2016-02-01 00:00:00 UTC | 2016-03-01 00:00:00 UTC | 0 | 0 | 0 |
| Mar 2016 | 2016-03-01 00:00:00 UTC | 2016-04-01 00:00:00 UTC | 1 | 0 | 1 |
What Hacker News says
4 sourcesWell, I think the line: "To those familiar with CoffeeScript, RapydScript is like CoffeeScript, but inspired by Python’s readability rather than Ruby’s cleverness." sums up the idea nicely. CoffeeScript took a strange turn a good while back (I think at the "literate" rewrite) -- where it sort of re-introduced behaviour similar in feel to missing-semicolon-maybe-a-bug-maybe-intended-behaviour... and departed from being "nicer javascript" to become more of "a language that compiles to javascript".
The mapping between the input and output javascript seems quite straightforward for these examples -- and the syntax seems simple(r) at first glance.
[ed: huh, speaking of semicolons and such, I just took a look at https://github.com/atsepkov/RapydScript -- and it mentions: "Note the comma on a new line following a function declaration, it needs t
Read the rest
o be there to let the compiler know there are more attributes in this object literal, yet it can't go on the same line as the function since it would get parsed as part of the function block. Like Python, however, RapydScript supports new-line shorthand using a ;, which you could use to place the comma on the same line:"
Yeah, well. Semicolon-sometimes is worse than semi-colon always. The fact that it's shorthand for '\n' makes it perhaps even worse. Other than that, I still like what I've seen.]
The other interesting and recent "Python in the browser" project is RapydScript - https://github.com/atsepkov/RapydScript
Unlike PythonJS, it does not have the goal of being 100% Python compatible, but instead takes the CoffeeScript approach. So, like Coffeescript, you get (mostly) clean Javascript output, no huge library dependency, runs nearly as fast as Javascript, etc.
Check out the "ants" demo - http://salvatore.pythonanywhere.com/RapydBox/default/editor
I've been playing around with both PythonJS and Rapydscript, and I like both. Different goals. PythonJS can output to Lua, too - so there's the whole Python in LuaJIT angle which could be very interesting as it matures.
In PythonJS now faster than CPythonRapydScript, javascript precompiler with python syntax
4 points · Open discussion