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const fastPow = (x, n) => {
  if (x <= 0) return 0;
  if (n === 0) return 1;
  if (n === 1) return x;
  
  const result = fastPow(x, n >> 1);
  
  return (n & 1) ? result * x : result;
};

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// doubly linked list

const removeNode = node => {
  node.prev.next = node.next;
  node.next.prev = node.prev;
  node.prev = node.next = node;
  return node;
};

class DLL {

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import {up, down} from './min-heap.js';

// more efficient operations based on up() and down()
// WARNING: untested (if I wrote comprehensive tests it wouldn't be a gist, would it?)

const replaceTop = (heapArray, value, less) => {
  const top = heapArray[0];
  heapArray[0] = value;
  down(heapArray, 0, less);
  return top;

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Shell scripting with Markdown documents

alias ~~~=":<<'~~~sh'";:<<'~~~sh'

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alternatively use: http://geoff.greer.fm/lscolors/

LSCOLORS

The value of this variable describes what color to use for which attribute when colors are enabled with CLICOLOR. This string is a concatenation of pairs of the format fb, where f is the foreground color and b is the background color.

The color designators are as follows:

a black

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This is the table from man 5 terminfo.

Do NOT hardcode terminal escape sequences. Use tput with the cap-names from the table below to get the right code for your terminal.

(P)	indicates that padding may be specified

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ANSI Escape Sequences

Standard escape codes are prefixed with Escape:

• Ctrl-Key: ^[
• Octal: \033
• Unicode: \u001b
• Hexadecimal: \x1B
• Decimal: 27

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# The approach is to mark packets from a specific user,
# create a dedicated routing table with a default route
# through the VPN, and force all marked packets to be
# routed using that table.
#
# Sources:
# https://www.niftiestsoftware.com/2011/08/28/making-all-network-traffic-for-a-linux-user-use-a-specific-network-interface/
# http://freeaqingme.tweakblogs.net/blog/9340/netflix-using-a-vpn-for-just-one-application.html

# In this guide

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// Copied from https://github.com/heya/dom under BSD-3 and slightly modified.

// create.js
// Dojo-inspired set of DOM utilities

export const namespaces = {
  svg: 'http://www.w3.org/2000/svg',
  xlink: 'http://www.w3.org/1999/xlink',
  ev: 'http://www.w3.org/2001/xml-events',
  xml: 'http://www.w3.org/XML/1998/namespace'

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// a facelift of the venerable on.js: slightly modified for ES6, removed dead browsers
// copied from https://github.com/clubajax/on, used under the MIT license

// internal utilities

const getNodeById = id => {
  const node = document.getElementById(id);
  if (!node) {
    console.error('`on` Could not find:', id);
  }