JS - Review

Leon Noel

#100Devs

Rap just make me anxious, and acid made me crazy
Them squares just made me looser and that wax just made me lazy
And I still make this song, and I'ma make another
If you ever actually hit me, better watch out for my brother

Agenda

Questions?
Review - HTML Fundamentals
Review - CSS Fundamentals
Review - JS Fundamentals
Review - Objects / APIs
Review - OOP
Homework - The Bank & Node

Questions

About last class or life

Active Recall

Ali Abdaal: https://youtu.be/ukLnPbIffxE

Forgetting Curve*

https://intelalearning.wordpress.com

Resetting Forgetting Curve

https://www.pearsoned.com/three-simple-research-based-ways-to-ace-a-test

Spaced Repetition

Ali Abdaal: https://youtu.be/Z-zNHHpXoMM

Where are you?
What do you want?

Happiest Career:

Ticketmaster Office

Baby Learns To Walk?

Half Hard Work and Half Believing You Can Do It

*thanks Vonds

Imposter Syndrome

Trough Of Sorrow

Manage Frustration

Consistency

Taking Care Of Yourself

Don't let your dreams be dreams

YOU OWE YOU

Text

Programming

A computer will do what you tell it to do.

What is a program?

A program is a set of instructions that you write to tell a computer what to do

What is a programming?

Programming is the task of writing those instructions in a language that the computer can understand.

Simple Circut

True Story

JAVASCRIPT

Has a specific 'Syntax'

Syntax: "Spelling and grammar" rules of a programming language.

JS Syntax

Semicolon
Brackets
Parentheses
Quotation Marks
Other Unique characters?

Has a specific 'Syntax'

Syntax: "Spelling and grammar" rules of a programming language.

Variables

What are variables?

Variables

We can tell our program to remember values for us to use later on

The entity we use to store the value is called a variable

Variables

Declaration: let age

Assignment: age = 25

Both at the same time:

let age = 25

Variable Conventions

camelCase:

let numberOfApples = 9

Variables

& Data Types

What can you store in variables?

Strings

Stores text
String is surrounded by quotes

"How is the weather today?"

'Warm'

Strings

Double vs Single Quoted Strings:

'They "purchased" it'
"It's a beautiful day"

Numbers

Represent Numerical Data

int: 29

float: 5.14876

Numbers

Signed

int: +4

float: -10.375

Arithmetic In Javascript

Let's Code

Variable Fun Time

Making Decisions

It's either TRUE or FALSE

If you are greater than 18 you are an adult

if (age > 18){
  console.log("You are an adult")
}

Comparisons:

Equality

Are two things equal?

9 === 9 //true
7 === 3 //false
"Hello" === "Hello" //true

Logical Operators

Conditional Syntax

if(condition is true) {
  //Do cool stuff
}

Conditional Syntax

if(condition is true) {
  //Do this cool stuff
}else if(condition is true){
  //Do this other cool stuff
}else{
  //Default cool stuff
}

Conditional Syntax

const pizza = "Dominos"

if (pizza === "Papa Johns") {
  console.log("Scram!")
} else if(pizza === "Dominos") {
  console.log("All aboard the train to flavor town")
} else {
  console.log("What are you even doing with your life?")
}

🚨 DANGER 🚨

Assignment vs. Comparison

Multiple Conditions

if (name === "Leon" && status === "Ballin"){
 //Wink at camera
}

Multiple Conditions

if (day === "Saturday" || day === "Sunday"){
  //It is the weekend
}

Let's Code

Age Checker

Functions

What are functions?

Functions

Functions are simple sets of instructions!
Functions are reusable
Functions perform one action as a best practice
They form the basic "building blocks" of a program

Functions

function name(parameters){
  //body
}

//call
name(arguments)

Functions

function yell(word){
  alert(word)
}


yell("HELLO")

Functions

function yell(word, otherWord){
  alert(word)
  alert(otherWord)
}


yell("HELLO","GOODBYE")

Let's Code

Simple Functions

Pseudo Code

Let's Code

A Temperature Converter

In Chat:

What is the best TV show of all time?

Answer:

The Bachelor

Let's Code

Bachelor Code

Loops

What are loops?

Loops

Repeat an action some number of times!
Three main types of loops in Javascript
For, while, and do while loops
Each type offers a different way to determine the start and end points of a loop

Loops - For

for ([initialExpression]; [conditionExpression]; [incrementExpression]){
  
  //do stuff 
  
}

Loops - For

for (let i = 1; i < 5; i++) {
  console.log(i)
}

Let's Code

21 Savage Loop

Loops - While

let count = 0 

while(count < 5){
  console.log(count)
  count++
}

Let's Code

Bring It On!

Arrays

What are arrays?

Toasters

Arrays

A data structure to store ordered collections!
Array elements are numbered starting with zero
Arrays have many methods to manage the order of elements
Can be created by a constructor or literal notation

Declaring Arrays

let newArr = new Array()

Array Constructor

Declaring Arrays

let newArr = []

Literal Notation

Declaring Arrays

newArr = ['Zebra',true,21]

Arrays are populated with elements

Elements can be of any type

Array Indexing

newArr = ['Zebra',,true,21]

console.log( newArr[0] )  //Zebra
console.log( newArr[1] )  //undefined
console.log( newArr[2] )  //true
console.log( newArr[3] )  //21

Elements can be accessed by their index numbers

Array Indexing

newArr = ['Zebra',,true,21]

newArr[1] = 'Bob'

console.log( newArr )  

// ['Zebra','Bob',true,21]

Elements can be updated by using the index at that position

Array Indexing

let cars = ['Honda', 'Toyota', 'Ford', 'Tesla']
let nums = [1,2,3]
cars = nums
console.log( cars ) //[1,2,3]

You can overwrite whole arrays by assigning an array to a different array

Array Length

console.log( newArr.length ) //4

How do you determine how many elements are in your array?

Let's Code

In Paradise: After Paradise

Array Iteration

let bestColors = ['green','blue','yellow','black']

for(let i = 0; i < bestColors.length;i++){
  console.log( bestColors[i] )
}

Iterates through an array passing in the value and index of each element

Array Iteration

let bestColors = ['green','blue','yellow','black']

bestColors.forEach((x,i)=> console.log(x))

Iterates through an array passing in the value and index of each element

Other Arrays Methods

let bestRappers2020 = ['6ix9ine','Polo G','6ix9ine']

let removed = bestRappers2020.shift()

console.log( bestRappers2020 ) // ['Polo G', '6ix9ine']

Remove item from the beginning of an Array

Other Arrays Methods

let bestRappers2020 = ['Polo G','6ix9ine']

let removedAgain = bestRappers2020.pop()

console.log( bestRappers2020 ) // ['Polo G']

Remove item from the end of an Array

Other Arrays Methods

let bestRappers2020 = ['Polo G']

let removed = bestRappers2020.unshift('Dylan')

console.log( bestRappers2020 ) // ['Dylan','Polo G']

Add item to the beginning of an Array

Other Arrays Methods

let bestRappers2020 = ['Dylan','Polo G']

let removed = bestRappers2020.push('Dylan')

console.log( bestRappers2020 ) // ['Dylan','Polo G','Dylan']

Add item to the end of an Array

Other Arrays Methods

let bestRappers2020 = ['Dylan','Polo G','Dylan']

let bestRappersAllTime = bestRappers2020.map(x => 'Dylan')

bestRappersAllTime.unshift('Dylan')
  
bestRappersAllTime.push('Dylan')

console.log( bestRappersAllTime ) 

// ['Dylan','Dylan','Dylan', 'Dylan', 'Dylan']

Let's Code

Winter Games

Objects

What are objects?

Objects

Objects are a collection of variables and functions!
Objects represent the attributes and behavior of something used in a program
Object variables are called properties and object functions are called methods
Objects store "keyed" collections

Think of a physical object

What are it's attributes and behaviors?

How about a stopwatch

What are its attributes and behaviors?

Stopwatch Object

Properties (attributes):
Might contain a variable to represent hours, another to represent minutes, and another to represent seconds.

Methods (behaviors):
Might also contain functions that manipulate those values, such as "start ()" and "stop ()".

Stopwatch Object

let stopwatch = {}

stopwatch.currentTime = 12

stopwatch.tellTime = function(time){
  console.log(`The current time is ${time}.`)
}

stopwatch.tellTime(stopwatch.currentTime)

Let's Code

Objects - Listen To Your Heart

Objects

What if we want to make

a lot of objects?

How much money you got? How many problems you got? How many people done doubted you? Left you out to rot?

Car Factory?

Constructors then Classes

Car Factory

Constructor

function MakeCar(carMake,carModel,carColor,numOfDoors){
  this.make = carMake
  this.model = carModel
  this.color = carColor
  this.doors = numOfDoors
  this.honk = function(){
    alert('BEEP BEEP FUCKER')
  }
  this.lock = function(){
    alert(`Locked ${this.doors} doors!`)
  }
}

let hondaCivic = new MakeCar('Honda','Civic','Silver', 4)

let teslaRoadster = new MakeCar('Tesla','Roadster', 'Red', 2)

Car Factory

We forgot enable bluetooth!

let teslaRoadster = new MakeCar('Tesla','Roadster', 'Red', 2)

console.log( teslaRoadster.bluetooth )  //undefined

MakeCar.prototype.bluetooth = true

console.log( teslaRoadster.bluetooth ) //true

A prototype is another object that is used as a fallback source of properties

Car Factory

Why does .toString() work?!?

let teslaRoadster = new MakeCar('Tesla','Roadster', 'Red', 2)

console.log( teslaRoadster.doors.toString() )  // "2" not 2

A prototype is another object that is used as a fallback source of properties

Let's Code

Objects - Street Fighter

Car Factory

Look Ma! New syntax!

class MakeCar{
  constructor(carMake,carModel,carColor,numOfDoors){
    this.make = carMake
    this.model = carModel
    this.color = carColor
    this.doors = numOfDoors
  }
  honk(){
    alert('BEEP BEEP FUCKER')
  }
  lock(){
    alert(`Locked ${this.doors} doors!`)
  }
}

let hondaCivic = new MakeCar('Honda','Civic','Silver', 4)

let teslaRoadster = new MakeCar('Tesla','Roadster', 'Red', 2)

Classes are like templates for objects!

APIs

What are APIs?

APIs

A simple interface for some complex action!
Think of a restaurant menu! Remember those...
Lets one thing communicate with another thing without having to know how things are implemented.

APIs

Fetch Fido, Fetch!

fetch("https://dog.ceo/api/breeds/image/random")
    .then(res => res.json()) // parse response as JSON
    .then(data => {
      console.log(data)
    })
    .catch(err => {
        console.log(`error ${err}`)
    });

API returns a JSON object that we can use within our apps

Let's Code

DOG PHOTOS!

APIs

Stop trying to make Fetch happen!

fetch(url)
    .then(res => res.json()) // parse response as JSON
    .then(data => {
      console.log(data)
    })
    .catch(err => {
        console.log(`error ${err}`)
    });

Some APIs need Query Parameters to return the correct data

const url = 'https://www.thecocktaildb.com/api/json/v1/1/search.php?s=margarita'

BUT WHY?

Why Use Objects?
Why Would We Need A Factory?

What if there was a system, a paradigm, a set of rules, an agreed upon way to structure our code that:

Made it easier to add new stuff

Made it easier to read through what was already coded

And made it so you were not afraid to make changes

Music & Light Warning - Next Slide

OOP BABY

OBJECT ORIENTED PROGRAMING

Let's Talk About It

This fusion of data and functionality into one object

Music & Light Warning - Next Slide

Encapsulation Baby

Encapsulation

The process of storing functions (methods) with their associated data (properties) - in one thing (object)*

*Nerds shaking violently

Complex or unnecessary details are hidden

This enables you to implement things without understanding or even thinking about all the hidden complexity

Smaller more manageable pieces of code

Do stuff once

Music & Light Warning - Next Slide

Abstraction Baby

Abstraction

Hide details

and show essentials

SIMPLE, PREDICTABLE, MANAGEABLE

Create New Objects Based On Old Ones

We just eliminated a bunch of redundant code

AKA

Music & Light Warning - Next Slide

Inheritance BABY

Inheritance

Make a class from another class to share a set of properties and methods

A piece of code that automagically works with a bunch of different objects

polymorphism allows us to override a method in every child class so it will do what we want

Instead of conditionals and switch cases

Music & Light Warning - Next Slide

POLYMORPHISM BABY

The Four Pillars

What if they actually made any sense...

Encapsulation

The process of storing functions (methods) with their associated data (properties) in one thing (object)

BUT WHY?

Made it easier to add new stuff

Made it easier to read through what was already coded

And made it so you were not afraid to make changes

Abstraction

Hide details

and show essentials

BUT WHY?

Smaller more manageable pieces of code

Helps you to split the complexity your software project into manageable parts

Make code changes and still sleep at night

Inheritance

Make a class from another class to share a set of properties and methods

BUT WHY?

Helps you eliminate redundant code

Polymorphism

A piece of code that automagically works with a bunch of different objects

polymorphism allows us to override a method in every child class so it will do what we want

BUT WHY?

Helps you avoid if/else and switch cases

Makes your code more reusable

Supports The

Other Pillars

Let's Code

Let's Build An Agency

Grab The Checklist

!checklist

Passing The Sniff

Bootcamper!

PUSH EVERY DAY

HITLIST

One of the most important things you will ever do for your career

USE THE SHEET!

NOW WITH TWO TABS!: Google Sheet

60 Networked

Applications

Find the hiring manager:

Add them to the hitlist
Follow them on Twitter
Find their email (hunter.io)
Ask for a coffee chat
Send a thank you
Get the recommendation

IF YOU EVER JUST CLICK APPLY

30 High Value Apps

Custom Resume, Cover Letter, and Story

10 Premium Apps

Custom everything plus, tweets, blog, and project

100Hours Project

Tie your past to your present and show you can code

100 Hours Project

Description (one paragraph)

Wireframe (wireframe.cc, figma, balsamiq)

Interviewing

Process

Apply / Recruited / Recommended
Phone Screen
Behavioral
Technical Questions
Take Home
Whiteboard
In-person
Wine and Dine Interview
Offer

*Every Company Is Wildly Different

Once Recommended

WHAT ARE THE STEPS IN THIS PROCESS?

Once Recommended

Find EVERYTHING about their process!
Glassdoor
Github

Blind

How to prepare?

The Bank

Link

Behavioral

C.A.R.

Cause Action Result

CAUSE

At my last company...
At my last opportunity...

LET THEM DIG!

ACTION

Steps you took

MUST BE POSITIVE

NO TIME TO BE HUMBLE DURING THE HUNT

RESULT

How are you better because of it

How are you the best thing since sliced bread because of it

Technical Questions

Explanation, Use, Example

Technical Whiteboard

P.R.E.P

Parameters, Returns, Examples, Pseudo Code

Homework

Do: Start prepping THE BANK

Do: Complete Your Professional Links

READ: Modern Javascript For Dinosaurs

WATCH: Node.js Crash Course (just get through it)

JS Review #100Devs

By Leon Noel

JS Review #100Devs

Review Class four our our Free Web Dev Bootcamp for folx affected by the pandemic. Join live T/Th 6:30pm ET leonnoel.com/twitch and ask questions here: leonnoel.com/discord

2,538

JS - Review

Leon Noel

#100Devs

Agenda

Questions?

Review - HTML Fundamentals

Review - CSS Fundamentals

Review - JS Fundamentals

Review - Objects / APIs

Review - OOP

Homework - The Bank & Node

Questions

About last class or life

Active Recall

Forgetting Curve*

Resetting Forgetting Curve

Spaced Repetition

Where are you? What do you want?

Baby Learns To Walk?

Half Hard Work and Half Believing You Can Do It

Imposter Syndrome

Trough Of Sorrow

Manage Frustration

Consistency

Taking Care Of Yourself

Don't let your dreams be dreams

YOU OWE YOU

Programming

A computer will do what you tell it to do.

What is a program?

A program is a set of instructions that you write to tell a computer what to do

What is a programming?

Programming is the task of writing those instructions in a language that the computer can understand.

Simple Circut

True Story

JAVASCRIPT

Has a specific 'Syntax'

JS Syntax

Semicolon

Brackets

Parentheses

Quotation Marks

Other Unique characters?

Has a specific 'Syntax'

Variables

What are variables?

Variables

Variables

Declaration: let age

Assignment: age = 25

Both at the same time:

let age = 25

Variable Conventions

camelCase:

let numberOfApples = 9

Variables

& Data Types

What can you store in variables?

Strings

Stores text

String is surrounded by quotes

"How is the weather today?"

'Warm'

Strings

Double vs Single Quoted Strings:

'They "purchased" it' "It's a beautiful day"

Numbers

Represent Numerical Data

int: 29

float: 5.14876

Numbers

Signed

int: +4

float: -10.375

Arithmetic In Javascript

Let's Code

Variable Fun Time

Making Decisions

It's either TRUE or FALSE

If you are greater than 18 you are an adult

Where are you?
What do you want?

'They "purchased" it'
"It's a beautiful day"