Shinkei

System Design Cheatsheet

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

Basic Steps

1. 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?

Shinkei

#!/usr/bin/env bash
set -e

main() {
  previous_file="$1"
  file_to_edit=`select_file $previous_file`

  if [ -n "$file_to_edit" ] ; then
    "$EDITOR" "$file_to_edit"
    main "$file_to_edit"

Shinkei

// Production steps of ECMA-262, Edition 6, 22.1.2.1
if (!Array.from) {
  Array.from = (function () {
    var toStr = Object.prototype.toString;
    var isCallable = function (fn) {
      return typeof fn === 'function' || toStr.call(fn) === '[object Function]';
    };
    var toInteger = function (value) {
      var number = Number(value);
      if (isNaN(number)) { return 0; }

Shinkei

'''
A password is complex enough, if it meets all of the following conditions:

    its length is at least 5 characters;
    it contains at least one capital letter;
    it contains at least one small letter;
    it contains at least one digit.

Determine whether a given password is complex enough.

Shinkei

/*
Implement a function that can divide two fractions and produce a reduced fraction.

Example

For a = [2, 3] and b = [5, 6], the output should be
fractionDivision(a, b) = [4, 5].
*/
function fractionDivision(a, b) {
    let fraction = [a[0] * b[1], a[1] * b[0]];

Shinkei

https://www.nationalgeographic.com/photography/photo-of-the-day/_jcr_content/.gallery.json | jq '.items[0]'

"url": "https://yourshot.nationalgeographic.com",

y dentro esta a lista de los tamaños que es .items[0].sizes["2048"]

script wget $(curl https://www.nationalgeographic.com/photography/photo-of-the-day/_jcr_content/.gallery.json | jq -r '.items[0].url + .items[0].sizes["2048"]')

Shinkei

use std::process::Command;
use std::env;
use std::str;


const IMAGE_PATH: &'static str = "/.natgeo-img/photo-of-the-day.jpg";
const NATGEO_JSON: &'static str = "https://www.nationalgeographic.com/photography/photo-of-the-day/_jcr_content/.gallery.json";

fn main() {
    download_image();

Shinkei

																																																																
																																																																
																																																																
																																																																
																																																																
					F	F	F	F	F	F	F	F	F	F	F	F	F	F	F	F	F	F	F	F	F	F	F	F	F	F	F		F		F	F	F				F	F	F	F	F	F	F	F	F	F	F													
					F																		F	F	F		F				F		F		F	F	F				F	F	F	F	F	F	F	F	F	F	F													
					F	F	F				F	F	F	F	F		F	F	F	F	F		F	F	F		F				F		F		F	F	F		F	F	F	F	F	F	F	F	F	F	F	F	F													
											F				F		F				F		F	F	F		F				F		F		F	F	F		F		F	F	F	F	F	F	F	F	F	F	F													
							F	F	F	F	F		F		F		F				F		F	F	F		F				F		F	F	F	F	F		F		F	F	F	F	F	F	F	F	F	F	F													

Shinkei

#Your optional code here
#You can import some modules or create additional functions


def checkio(number):
    #Your code here
    #It's main function. Don't remove this function
    #It's using for auto-testing and must return a result for check.
    if number < 0:
        return "%d is not dicisible by 3 or 5"

Shinkei

.hidden{
  display: none;
}