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Jeremy Ashkenas jashkenas

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View .bashrc
# MAC manipulators
alias random_mac='sudo ifconfig en0 ether `openssl rand -hex 6 | sed "s/\(..\)/\1:/g; s/.$//"`'
alias restore_mac='sudo ifconfig en0 ether YOUR_ORIGINAL_MAC_ADDRESS_GOES_HERE'
#!/usr/bin/perl -w
# Plugin for watching io-bound traffic (in blocks) on disks.
# Usage: Link or copy into /etc/lrrd/client.d/
# Parameters:
# config (required)
# autoconf (optional - used by lrrd-config)
jashkenas /
Last active Mar 30, 2022
Why Semantic Versioning Isn't

Spurred by recent events (, this is a quick set of jotted-down thoughts about the state of "Semantic" Versioning, and why we should be fighting the good fight against it.

For a long time in the history of software, version numbers indicated the relative progress and change in a given piece of software. A major release (1.x.x) was major, a minor release (x.1.x) was minor, and a patch release was just a small patch. You could evaluate a given piece of software by name + version, and get a feeling for how far away version 2.0.1 was from version 2.8.0.

But Semantic Versioning (henceforth, SemVer), as specified at, changes this to prioritize a mechanistic understanding of a codebase over a human one. Any "breaking" change to the software must be accompanied with a new major version number. It's alright for robots, but bad for us.

SemVer tries to compress a huge amount of information — the nature of the change, the percentage of users that wil

jashkenas / sounder.rb
Created Feb 20, 2009
A Demonstration of Minim in Ruby-Processing
View sounder.rb
# Sounder sounds for class
# Requires an active microphone to pick up anything
require 'ruby-processing'
class MinimTest < Processing::App
load_library "minim"
import "ddf.minim"
import "ddf.minim.analysis"
View minimalist-classes.js
// Here is a proposal for minimalist JavaScript classes, humbly offered.
// There are (at least) two different directions in which classes can be steered.
// If we go for a wholly new semantics and implementation, then fancier classical
// inheritance can be supported with parallel prototype chains for true inheritance
// of properties at both the class and instance level.
// If however, we keep current JavaScript prototype semantics, and add a form that
// can desugar to ES3, things must necessarily stay simpler. This is the direction
// I'm assuming here.
View underscore.js
// Underscore.js
// (c) 2010 Jeremy Ashkenas, DocumentCloud Inc.
// Underscore is freely distributable under the terms of the MIT license.
// Portions of Underscore are inspired by or borrowed from Prototype.js,
// Oliver Steele's Functional, and John Resig's Micro-Templating.
// For all details and documentation:
(function() {
// ------------------------- Baseline setup ---------------------------------
View gist:3796782
#!/usr/bin/env ruby
cmds = []
cmds << "git co gh-pages"
cmds << "git merge master"
cmds << "git push github gh-pages"
cmds << "git co master"
system cmds.join("&&")
View wait-google-sent-me.js
var active = false;
function changeRefer(details) {
if (!active) return;
for (var i = 0; i < details.requestHeaders.length; ++i) {
if (details.requestHeaders[i].name === 'Referer') {
details.requestHeaders[i].value = '';
View npm-password-leak.txt
Security Alert - Please reset your npm registry account
The security of the npm registry has just been upgraded. This corrects a known
flaw which led to the leakage of the password_sha and salt fields. The good
news is that the leak is plugged. The bad news is that it existed for quite a
View backbone-ember-back-and-forth-transcript.txt
For those folks not already hanging out in #documentcloud... here's the log of this afternoon's Ember/Backbone politics discussion.
12:21 PM <wycats> jashkenas: hey
12:21 PM <wycats> jashkenas: I'm sorry
12:21 PM <wycats> how would you like me to describe backbone?
12:21 PM <wycats> let's work this out for once and for all :)
12:21 PM <wycats> I'm definitely not intentionally saying incorrect things about backbone
12:22 PM • knowtheory gets out popcorn
12:24 PM <jashkenas> don't worry about it too much -- I'm just not terribly pleased with backbone being continued to be used as the strawman...
12:24 PM <wycats> jashkenas: I am worried about it a lot