parkerproject

FWIW: I (@Rondy) am not the author of the content presented here, which is an outline from Edmond Lau's book. I've just copy-pasted it from somewhere and saved as a personal gist, before it got popular on newsnews.ycombinator.com. I don't remember where exactly the original source is from and neither could find the author's name, so I cannot give him/her the proper credits.

---

Effective Engineer - Notes

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

parkerproject

class ListNode {
  constructor(value) {
    this.value = value;
    this.next = null;
  }
}

function reverseLinkedList(head, prev = null) {
  if (head === null) {
    return prev;

parkerproject

// Definition for singly-linked list
function ListNode(val) {
  this.val = val;
  this.next = null;
}

// Function to reverse a singly-linked list
function reverseLinkedList(head) {
  let prev = null;
  let current = head;

parkerproject

/*
This memoize function takes in another function as its argument (func) 
and returns a new function that caches the results of func based on its arguments.

The returned function first checks if the arguments have already been cached 
by checking if there is a key in the cache object with the same JSON stringified arguments (key). 
If there is a cached value, it returns it. If not, it invokes the original function func with the arguments, 
caches the result under the key, and returns the result.
*/

parkerproject

// https://angularfirebase.com/lessons/firestore-security-rules-guide/

// https://medium.com/@jek.bao.choo/my-firestore-security-rules-learning-notes-14316400f160

Scope Rules to Specific Operations Rules can be enforced on various read/write operations that occur in a clientside app. We can scope rules to each of the follow read operations.

allow read - Applies to both lists and documents. allow get - When reading a single document. allow list - When querying a collection.

parkerproject

# https://stackoverflow.com/questions/69343233/github-action-increment-version-on-push-to-main

name: Version Increment

on:
  push:
    branches:
      - main

jobs:

parkerproject

name: Create Release Branch
on:
  workflow_dispatch:
    inputs:
      versionName:
        description: 'Name of version  (ie 5.5.0)'
        required: true
      versionCode:
        description: 'Version number (50500)'
        required: true

parkerproject

var groupBy = function(data, key) { // `data` is an array of objects, `key` is the key (or property accessor) to group by
  // reduce runs this anonymous function on each element of `data` (the `item` parameter,
  // returning the `storage` parameter at the end
  return data.reduce(function(storage, item) {
    // get the first instance of the key by which we're grouping
    var group = item[key];
    
    // set `storage` for this instance of group to the outer scope (if not empty) or initialize it
    storage[group] = storage[group] || [];
    

parkerproject

Largest 1000 Cities in America
2013 popuation data - Biggest US Cities By Population

rank,city,state,population,2000-2013 growth

1,New York,New York,8405837,4.8%
2,Los Angeles,California,3884307,4.8%
3,Chicago,Illinois,2718782,-6.1%
4,Houston,Texas,2195914,11.0%
5,Philadelphia,Pennsylvania,1553165,2.6%

parkerproject

User Stories

Reading list

• [Mark Shead: Creating Good User Stories][Mark Shead]
• [GOV.UK Service manual: Writing user stories][GOV.UK]
• [Mike Cohn's blog posts about user stories][Mike Cohn]
• [Mike Cohn: User Stories Applied (book)][User Stories Applied]