indy.cody- Oct. 19th, 2022

Notes from 2022 Indy.Code()

Typescript (By Eric Potter from Sweetwater)

IntersectionTypes

Programmer = boolean & string

Union Types

type Person = Programmer | Tester

Common Use Case:
    - Dealing with Errors

String Literals

export type Grade = "A" | "B" | "C"

Template Literals

type GradeModifiers = "+" | "" | "-"
export type expandedGrades = `${Grade}${GradeModifiers}`

Utility Types

- Allows me to modified other types

Indexed Access Types

- Handy for staying in sink with a changing dataset

General

- A lot of things you can do but shouldn't
- Code: https://github.com/pottereric/Typescriptbeyondthebasics
- Eric: https://humbletoolsmith.com/

Building Event-Driven Microservices (by Chad Green)

EDA = event-driven architecture

When do I use this

- Multiple subsystems
- Real-time Processing
- Complex Event Processing
- High Volumne/Veloity Data

Denefits

- Decoupling
- Encapsulation
- Responsive
- Scalable/Distributed
- Independence

Drawbacks

- Steep learning curve
- Complexity

Limitations

- Guaranteed Delivery (if you one of your subscribers goes down you aren't going to receive it)
- Sequencing

Implementation Options

- Azure Event Hubs
    1] works well with Kafka
    2] Partitions
    3] Throughput units
- Azure Service Bus

Funtional-Flavored Javascript (by Dave Fancher)

Tenets of Func. Prgoramming

1) Purity/Controlling side-effects
2) Favor expressions over statements
3) Functions as Data

Immutability

- Immutable.js
- Object.freeze()
- Defineproperty
- Arrow functions
    - Functions as data

Built in Functions

- learn about reduce
- Currying
PFA - Partial Function Addition

Composability

ES6 symbols

- Contact free extension point

Extending Object / Model-Based Validation

Knowing Your Limitations: The Key to improving your softwared design devisions (by Eric Potter)

Humility != Self Description

Edimology of Humility - grounded (*)

List of Cognitive biases: https://en.wikipedia.org/wiki/List_of_cognitive_biases

Admitting the possibility of error leads to:

- Better testing
- Better code reviews
- Asking for help appropriately
- better naming and documentation

Admitting that others may know mores leads to:

- Use of better solutions
- Use of better methods
- Use of better architectures

Admitting that we need to learn leads to:

- Lifelong learning
- Asking better questions

Self-accurate Thinking:

- Dunning-Kruger Effect
- Book: The Programmer's Brain by Felienne Hermans
    - (Book Link)[https://www.amazon.com/Programmers-Brain-every-programmer-cognition/dp/1617298670/ref=sr_1_1?crid=2E5SPCV7EITPW&keywords=the+programmers+brain&qid=1666197734&qu=eyJxc2MiOiIxLjg3IiwicXNhIjoiMS43NCIsInFzcCI6IjEuODUifQ%3D%3D&sprefix=the+programmers%2Caps%2C159&sr=8-1]
- The Magic Number Seven, Plus or Minues Two ( by George A Miller)
    - Thinnk about this as far as refactoring and chunking into smaller chunks... aka reorganizing into smaller units
- The Checklist Manifesto by Atul Gawande
    - https://www.amazon.com/Checklist-Manifesto-How-Things-Right-ebook/dp/B0030V0PEW/ref=sr_1_1?crid=290RQRELQNGAM&keywords=the+checklist+manifesto&qid=1666197957&qu=eyJxc2MiOiIxLjgyIiwicXNhIjoiMS4zMyIsInFzcCI6IjEuNDEifQ%3D%3D&sprefix=The+Checklist+%2Caps%2C186&sr=8-1
- Humility is the New Smart by Edward D Hess & Katherine Ludwig
- Be in the the rethinking cycle versus the overconfident cycle
- "Humility is not thinking less of yoruself, but thinking of yourself less"

**Humility is OTHERS oriented

Focus of helping:

- Teammates
- Users

GOAL of software development:

As software developers, we build tools:

Help our users:
- Work faster
- Know more

Javascript Metaprogramming (by Dave Francher)

What is metaprogramming?

- Programming about programming/code about code
- 3 Categories:
    1) Code generatin
    2) Reflection
    3) Intercession

- Consider lodash for type detection

Simple (Classic) Reflection

    const myObject = {
        firstName: "Austin",
        lastName: "Bearden"
    }

    Reflect.has(myObject, "age"); // false

    Reflect.defineProperty(
        myObject,
        "age",
        {
            configurable: true,
            enumerable: true,
            writable: true,
            value: 42
        }
    ); // true

- Reflect will return whether or not the defineProperty was successful for onot
- Object will return the object

Symbols - Collision-Free Extension Points

Kinda like an OOO Interface

Guaranteed conflict free

Defining symbols

// no label
const greet = Symbol("greet")

Intercession

Ship Accessability by Dale Sande from Alaska Airlines

To-do: interact with a website with black screen and only use screen reader as a blind person

To-do: watch a video or sit in session where a blind person is using screen reader on website

Tools:

blind
only keyboard interaction
Color blindness

Section 508:

Anyone who touches frontend code is responsible to make accessable

Companies to solve Accessability:

    - Level access

Web AIM - group of people who are accessability advocites

Evaluate the invisible spec

ARIA <-- learn more about it

HTML Custom Elements

LIT - Google library: https://lit.dev/

Template literals

Tagged template literals

-- Look up the html <slot></slot> element

Securing a WebAPI with JWT Token Role-Based Authentication by Victor Pudelski

JWT Structures

1) Header - 
2) Payload - The Claims of information of the JSON obbject
3) Signature - A cryptographic signature to validate the integrity of the payload

Storing on local or session

- session is only stored on one tab
- local is across tabs
    - If multiple tabs required do local storage
    - Either way use refresh tokens so JWt isn't just sitting there exposed
    - If we are not logged in, don't store it in session storage

(consider this for PMI authentication implementation)

Files

README.md

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