Raymond Gan rayning0

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Cheatsheets

GenServer Cheatsheet by Benjamin Tan Wei Hao

Books

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?

First of all, please note that token expiration and revoking are two different things.

Expiration only happens for web apps, not for native mobile apps, because native apps never expire.
Revoking only happens when (1) uses click the logout button on the website or native Apps;(2) users reset their passwords; (3) users revoke their tokens explicitly in the administration panel.

1. How to hadle JWT expiration

A JWT token that never expires is dangerous if the token is stolen then someone can always access the user's data.

Quoted from JWT RFC:

Project Title

One Paragraph of project description goes here

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

	// Different ways to read/write input in Golang:
	// ----------HackerRank----------
	// read from 3 nums from command line
	package main

	import "fmt"

	func main() {
	var n int
	var a int

	# Not working yet
	# a = [1, 5, 2, -2]
	# s = [-1, 1, -1, 1]

	# summation
	def val(a, s)
	sum = 0
	a.size.times do \|i\|
	sum += a[i] * s[i]
	end

	class Example12 {
	public static void permutation(String str) {
	permutation(str, "");
	}

	public static void permutation(String str, String prefix) {
	if (str.length() == 0) {
	System.out.println(prefix);
	} else {
	for (int i = 0; i < str.length(); i++) {

	const myfunc = (add1, add2) => {
	return new Promise((resolve, reject) => {
	const new_value = add1 + add2;
	setTimeout(() => {
	resolve(new_value);
	}, 3000);
	})
	};

	myfunc(1, 5)

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	"editor.snippetSuggestions": "top",
	"editor.formatOnPaste": true,
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	"editor.wordWrap": "on",
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