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carlmjohnson /
Last active Dec 19, 2018
How to chain exceptions in Python
# Thing that creates exceptions
def r(n):
raise Exception(f"error: {n}")
# Add exceptions to a list
errors = []
for n in range(10):
carlmjohnson / markov.js
Created Nov 5, 2018
Simple Markov text generator
View markov.js
class Markov {
constructor(text) {
text = text.replace(/\./g, " . ");
text = text.replace(/\s\s+/g, " "); = {};
let w1 = "";
let w2 = "";
text.split(/\s/).forEach(w3 => {
if (![w1 + " " + w2])[w1 + " " + w2] = [];[w1 + " " + w2].push(w3);
View html-scan.go
package main
import (
const html = `
View As() and Is() are useful for optional interfaces beyond

EDIT: On further thought, the implications of using iface.As, e.g., for io.WriterTo are quite subtle. If you were trying, say, to add logging to all Read calls, you wouldn't want to simply pass through to the underlying io.WriterTo because the call would go unlogged. Instead you'd need to implement the As method on your type so as to only return a WriterTo under certain conditions. Still, I think this idea is worth exploring more.

The Go 2 process has produced a proposal for extending the errors standard package, which is currently in testing.

My observation about the experimental errors package is: As() and Is() solve problems that exist well beyond the error interface.

Essentially the problem is this, many packages begin by requiring a certain interface, such as error, io.Reader, or

View combinations.go
package main
import (
func Combinations(n int, combs []int) (next func() bool) {
k := len(combs)
if k == 0 || n < k {
View utils.js
const onAnimate = (eventType, callback) => {
let timeout;
window.addEventListener(eventType, ev => {
if (timeout) {
timeout = window.requestAnimationFrame(callback);
carlmjohnson /
Created Sep 3, 2019
For SVG files with bloated PNG embeds
def xtract_pngs_from_svgs(name):
fname = name +'.svg'
with open(fname) as f:
raw =
prefix = 'xlink:href="data:image/png;base64,'
suffix = '"'
chunks = []
found = []
View credit-card.vue
<div id="app">
Value is "{{ value }}". <br />
<input v-model="value" @input="handleChange($event)" />
function trimAndSpace(val) {
return val
View Article Bits.ipynb
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carlmjohnson / random.js
Created Jan 24, 2020
Generate random hex digits
View random.js
function randomHex(n) {
let bytes = new Uint8Array(n);
return Array.from(bytes).map(b => b.toString(16).padStart(2, '0')).join('');
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