MichaelWalker-git

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?

MichaelWalker-git

let map = new Map();
map.set("a", 1);
map.set("b", 2);
map.set("c", 3);

let obj = Array.from(map).reduce((obj, [key, value]) => (
  Object.assign(obj, { [key]: value }) // Be careful! Maps can have non-String keys; object literals can't.
), {});

console.log(obj); // => { a: 1, b: 2, c: 3 }

MichaelWalker-git

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

• Stores data elements based on an sequential, most commonly 0 based, index.
• Based on tuples from set theory.

MichaelWalker-git

// Simple problems to solve using the native .reduce and .map array methods. Each of these problems can be solved in many
// different ways, but try to solve them using the requested higher order function.

// MAP

// Write a function capitalize that takes a string and uses .map to return the same string in all caps. 
// ex. capitalize('whoop') // => 'WHOOP'
// ex. capitalize('oh hey gurl') // => "OH HEY GURL"
var capitalize = function(string){
  // code code code!