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System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

Anchors in Markdown

To create an anchor to a heading in github flavored markdown. Add - characters between each word in the heading and wrap the value in parens (#some-markdown-heading) so your link should look like so:

[create an anchor](#anchors-in-markdown)

Connecting to wifi network through command line

I am trying to connect to my WEP network just using the command-line (Linux).

I run:

sudo iwconfig wlan0 mode Managed essid 'my_network' key 'xx:xx:... hex key, 26 digits'

Then I try to obtain an IP with

Let's install Debian 9.0 "Stretch" on QEMU MIPS32 under Ubuntu.

Step 1: Install QEMU

sudo apt install qemu-system-mips

Step 2: Download Linux kernel and installation image

wget http://ftp.debian.org/debian/dists/stretch/main/installer-mipsel/current/images/malta/netboot/vmlinux-4.9.0-11-4kc-malta

React topics checklist

A checklist for learning React - Fork it and start ticking off topics!

React fundamentals

use-cases of React
JavaScript basics for React
- immutability / data management without mutations
updating properties of objects

	import { BatchExecuteStatementCommand, BatchExecuteStatementCommandInput, BatchGetCommand, BatchGetCommandInput, DeleteCommand, DeleteCommandInput, ExecuteStatementCommand, ExecuteStatementCommandInput, ExecuteTransactionCommand, ExecuteTransactionCommandInput, GetCommand, GetCommandInput, PutCommand, PutCommandInput, QueryCommand, QueryCommandInput, ScanCommand, ScanCommandInput, UpdateCommand, UpdateCommandInput } from "@aws-sdk/lib-dynamodb";
	import { Logger } from "@nestjs/common";
	import { DbClientsInstance } from "./db.clients";

	class DbDataOps {
	private static instance: DbDataOps;

	private constructor() {
	console.log('DbDataOps init');
	if(DbDataOps.instance) {

	trigger:
	branches:
	include:
	- master
	- develop
	- refs/tags/*

	pool:
	vmImage: 'ubuntu-18.04'

	Após instalar o MariaDB você consiga entrar no banco de dados sem senha ou mesmo digitando qualquer senha ele entra, faça os passos a seguir para resolver esse problema.

	1 - Conectar no banco:
	sudo mysql -u root

	2 - Consultar usuário cadastrados na tabela user

	SELECT user, host FROM mysql.user;
	+------------------+-----------+
	\| User \| Host \|

	:root {
	--ease-in-quad: cubic-bezier(.55, .085, .68, .53);
	--ease-in-cubic: cubic-bezier(.550, .055, .675, .19);
	--ease-in-quart: cubic-bezier(.895, .03, .685, .22);
	--ease-in-quint: cubic-bezier(.755, .05, .855, .06);
	--ease-in-expo: cubic-bezier(.95, .05, .795, .035);
	--ease-in-circ: cubic-bezier(.6, .04, .98, .335);

	--ease-out-quad: cubic-bezier(.25, .46, .45, .94);
	--ease-out-cubic: cubic-bezier(.215, .61, .355, 1);

	Maintainers:
	davidtwco: cargo-bisect-rustc, cargo-bisect-rustc