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# 1. 公司电脑打开 远程登录 功能

# 2. 公司电脑连接到 服务器，并监听服务器本地 3456 端口
#    当有链接到服务器 3456 时，tunnel 回公司电脑的 22 端口，及 sshd 服务

ssh -NR 3456:localhost:22 server


# 3. 在家链接公司服务器 3456 端口
#    假设服务器登录时不需要输入密码。

wongyouth

1. Map 没有来自 Object.prototype 的属性，比如： __proto__, toString

2. Map 中的key可以是任何类型，Object 只能是 String

3. Map 对象迭代时的顺序与加入时的顺序一致。


ref: https://ponyfoo.com/articles/es6-maps-in-depth

wongyouth

# Write a function gcd(x,y) that finds the greatest common divisor between two nonnegative integers.
# Algebraically, gcd(x,y) is x if y is zero; it’s gcd(y, rem(x,y)) otherwise.
defmodule Mathx do
  def gcd(x, 0) do
    x
  end
  
  def gcd(x, y) do
    gcd(y, rem(x,y)
  end

wongyouth

%.csv : %.json
	@cat $< | $(MAKE) -s words | $(MAKE) -s csv > $@

# {
#   "code": "0",
#   "data": {
#     "block": [
#       {
#         "type": "text",
#         "line": [

wongyouth

function * fab (max) {
  let [n, a, b] = [0, 0, 1]
  while (n++ < max) {
    [a, b] = [b, a + b]
    yield b
  }
}

for (let n of fab(5)) {
  console.log(n)

wongyouth

Mongodb

Mongo Console Shell

db.coll.find().forEach(doc => {})

loop all documents and update

db.coll.find().forEach(doc => { // ... change doc

// update

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{
	// Place your snippets for vue here. Each snippet is defined under a snippet name and has a prefix, body and 
	// description. The prefix is what is used to trigger the snippet and the body will be expanded and inserted. Possible variables are:
	// $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders. Placeholders with the 
	// same ids are connected.
	// Example:
	// "Print to console": {
	// 	"prefix": "log",
	// 	"body": [
	// 		"console.log('$1');",

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{
	// Place your global snippets here. Each snippet is defined under a snippet name and has a scope, prefix, body and 
	// description. Add comma separated ids of the languages where the snippet is applicable in the scope field. If scope 
	// is left empty or omitted, the snippet gets applied to all languages. The prefix is what is 
	// used to trigger the snippet and the body will be expanded and inserted. Possible variables are: 
	// $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders. 
	// Placeholders with the same ids are connected.
	// Example:
	// "Print to console": {
	// 	"scope": "javascript,typescript",

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// https://github.com/nuxt/example-auth0/blob/master/utils/auth.js

const getQueryParams = () => {
  const params = {}
  window.location.href.replace(/([^(?|#)=&]+)(=([^&]*))?/g, ($0, $1, $2, $3) => {
    params[$1] = $3
  })
  return params
}

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-- see https://github.com/ankidroid/Anki-Android/wiki/Database-Structure for a more maintained version of this

-- cards are what you review. easy!
CREATE TABLE cards (
    id              integer primary key,
      -- the epoch milliseconds of when the card was created
    nid             integer not null,
      -- notes.id
    did             integer not null,
      -- deck id (available in col table)