Xilin Sun aenon

Docker Cheat Sheet

Why Docker

"With Docker, developers can build any app in any language using any toolchain. “Dockerized” apps are completely portable and can run anywhere - colleagues’ OS X and Windows laptops, QA servers running Ubuntu in the cloud, and production data center VMs running Red Hat.

Developers can get going quickly by starting with one of the 13,000+ apps available on Docker Hub. Docker manages and tracks changes and dependencies, making it easier for sysadmins to understand how the apps that developers build work. And with Docker Hub, developers can automate their build pipeline and share artifacts with collaborators through public or private repositories.

Docker helps developers build and ship higher-quality applications, faster." -- What is Docker

Tree Node in JavaScript

Implementation

const TreeNode = val => {
    let value = val
    let children = []
    const getValue = () => value
    const getChildren = () => children
    const setValue = newVal => {value = newVal}
 const addChild = childNode =&gt; {children.push(childNode)}

defaultObj - JavaScript implementation of Python collections.defaultdict

Implementation

const defaultObj = (defaultValue = undefined) => {
    const defaultObj = {}
    const set = (key, value) => {
        defaultObj[key] = value
    }
    const get = key => {
 if (key in defaultObj) {

	import http.server
	import cgi
	import base64
	import json
	from urllib.parse import urlparse, parse_qs


	class CustomServerHandler(http.server.BaseHTTPRequestHandler):

	def do_HEAD(self):

	var createSLL = () => {
	let head = null

	const getHead = () => head

	const push = value => {
	let node = {value, next: null}
	if (!head) {
	head = node
	}

	# bz2
	import bz2
	with bz2.BZ2File("myfile.txt.bz2") as f:
	line_list = f.readlines()

	#!/bin/bash
	# watchman_xenial.sh
	# installs watchman on Ubuntu 16.04

	# working directory
	WD="${HOME}/Applications"

	# watchman branch to get and install
	WATCHMAN_BRANCH="v4.9.0"

	# This programme tests the "HHT and HTT" probability problem
	# by Xilin SUN

	NumberofCases <- 50000
	cat("Doing a test with ", NumberofCases, " cases.","\n")
	CaseHHT <- 0
	CaseHTT <- 1

	for(i in 1:NumberofCases){
	Digit1 <- sample(0:1, 1)

	#!/usr/bin/env python
	# -- coding: utf-8 --
	# This programme tests the "HHT and HTT" probability problem
	# by Xilin SUN

	# Problem: A fair coin is tossed consecutively. Once the sequence
	# "HHT" appears, person A wins and the game is terminated. Once the
	# sequence "HTT" appears, person B wins and the game is also terminated.
	# Find the probability that person A wins.