Sunny Gonnabathula sunny-g

System Design Cheatsheet

use case : the things your system needs to be do.

constraints : the things your system will have to consider to be able to do stuff

	FROM golang:1.6.2

	COPY . /go

	RUN go get github.com/nats-io/nats
	RUN go build api-server.go

	EXPOSE 8080
	ENTRYPOINT ["/go/api-server"]

	/**
	* Base contract that all upgradeable contracts should use.
	*
	* Contracts implementing this interface are all called using delegatecall from
	* a dispatcher. As a result, the _sizes and _dest variables are shared with the
	* dispatcher contract, which allows the called contract to update these at will.
	*
	* _sizes is a map of function signatures to return value sizes. Due to EVM
	* limitations, these need to be populated by the target contract, so the
	* dispatcher knows how many bytes of data to return from called functions.

	const fetchContent = (url) =>
	rx.Observable.create(observer =>
	fetch(url)
	.then(res => res.json())
	.then(json => {
	observer.onNext(json)
	observer.onCompleted()
	)
	.catch(e => observer.onError())
	)

	this.ycQuestions = [
	"So what are you working on?",
	"Have you raised funding?",
	"What makes new users try you?",
	"What competition do you fear most?",
	"What’s the worst thing that has happened?",
	"Will you reincorporate as a US company?",
	"What’s an impressive thing you have done?",
	"Where is the rocket science here?",
	"Why did you pick this idea to work on?",

	import React, {Component} from 'react';
	import ReactDOM from 'react-dom';
	import {observable, computed} from 'mobx';
	import {observer} from 'mobx-react';
	// import DevTools from 'mobx-react-devtools';

	class Server {
	@observable days = [];
	@observable name = "";
	@computed get upDays() {

	//
	// In Solidity, a mapping is like a hashmap and works with `string` like this:
	// mapping (string => uint) a;
	//
	// However it doesn't support accessors where string is a key:
	// mapping (string => uint) public a;
	//
	// "Internal compiler error: Accessors for mapping with dynamically-sized keys not yet implemented."
	//
	// An accessor returns uint when called as `a(string)`.


	<html>
	<head>
	<meta name="description" content="React Barchart animated">
	<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.5.1/lodash.min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.7/react-with-addons.js"></script>

	<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.7/react-dom.js"></script>
	<meta charset="utf-8">

	const ReactPerf = require('ReactPerf');
	const TRACE_DOM = false;

	function reactPerfTrace(objName: string, fnName: string, func: any): any {
	return function(component) {
	let label;

	if (objName === 'ReactCompositeComponent') {
	var instName = this.getName() \|\| 'Unknown';
	label = fnName === 'mountComponent' \|\| fnName === 'updateComponent' ? instName : `${instName}.${fnName}`;