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SHOW HN2012

Powerful Pattern Matching for Javascript

Shown by natefaubion on Sep 13, 2012. Click the card to turn it over.

96points

20comments

#228of 1,677 in 2012

Top 14%of 2012 by points

How HN took it

MixedNo clear lean

4 positive, 3 neutral or asking, 1 mixed, 2 critical, out of 10 comments about the project. Thread score +0.24.

Idea: 3 for, 0 againstDesign: 1 for, 2 against

Each row is a top-level comment and its replies, in HN's order. Select a cell to open that comment on HN.

positive neutral or mixed critical about another commenter or something else the maker

Makes overloading declarative and cleaner for maintenance
From 1 comment
- I didn't know I needed this until I saw it and had that A-HA moment when I realized how much cleaner this would make a lot of code. Instead of hiding away the logic in a bunch of…
  OmarIsmail on HN
Useful addition to JavaScript
From 2 comments
- i want this in js for a long time
  elliotlai on HN
- Awesome! This is so useful!
  dreamdu5t on HN

Relies on object key order, which ECMAScript does not guarantee
From 1 comment
- Cool! Sucks that it has to be so stringly typed, but I can't see another alternative. One concern: "Each pattern will be tried in order until a match is found." As far as I know,…
  jpolitz on HN
Readability concerns in large JavaScript codebases
From 2 comments
- I've come across aspects of this functionality before in a couple of languages now, even psql, however looking at this JavaScript way of doing it, I have to question whether it…
  se85 on HN
- Thanks, I misread the first time, made sense the second time! My mistake! I still have my doubts as to how readable such an approach like this would be in large JavaScript…
  se85 on HN
String-based patterns feel stringly typed
From 1 comment
- Cool! Sucks that it has to be so stringly typed, but I can't see another alternative. One concern: "Each pattern will be tried in order until a match is found." As far as I know,…
  jpolitz on HN

Support for CoffeeScript-style pattern matching
From 1 comment
- Something like this would make a great addition to CoffeeScript.
  danh on HN

What are applications of pattern matching?
From 1 comment
- What are some applications of pattern matching?
  username3 on HN

Multimethods via bilby.js
From 1 comment
- Sucks that it has to be so stringly typed, but I can't see another alternative. Multimethods would be an alternative to this type of ad-hoc polymorphism. I've encoded immutable…
  pufuwozu on HN
LiveScript implicit switch
From 1 comment
- Check out LiveScript's implicit switch syntax: http://gkz.github.com/LiveScript/#switch
  oscilloscope on HN
XRegExp
From 1 comment
- For those interested: XRegExp (http://xregexp.com) is also relevant. (Not a direct competitor to Matches.js, but has some nice features)
  pooriaazimi on HN