Javascript - More Basics

Leon Noel

"If I get caught up in the storm, my brain gon storm the most"

#100Devs

Agenda

  • Questions? 

  • Let's Talk -  Imposter Syndrome

  • Learn - What is programming?

  • Learn - JS Basics

  • Review - Previous Class Work 

  • Learn - Pseudo Code

  • Build - Temperature Converter

  • Learn - Functions

  • Build - Functions

  • Homework - Read Please 

Questions

About last class or life

Checking In

Like and Retweet the Tweet

!checkin

Submitting Work

 Share What JS You Added in codepen.io

Submit URLs here: https://forms.gle/G7LhHnyTA7zYq7UV6

Networking

2 Individuals Already In Tech

Push? 1 Coffee Chat

Imposter Syndrome

The Golden Rule

SEPERATION OF CONCERNS

  • HTML = Content / Structure

  • CSS = Style

  • JS = Behavior / Interaction

IDs & Classes

IDs

#zebra {
  color: red;
}

IDs are used for selecting distinct elements

Only one id with the same value per document

#idName

<section>
  <p>Hello, Twitch!</p>
  <p id="zebra">Hello, Youtube!</p>
</section>

Classes

.bob {
  color: red;
}

Classes are for selecting multiple elements

Multiple with same value allowed per document

.className

<section>
  <p class="robot">Hello, Twitch!</p>
  <p id="zebra" class="bob">Hello, Youtube!</p>
  <p class="bob">Goodbye, Mixer!</p>
</section>

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.

True Story

JAVASCRIPT

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

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

Class, Weekend, or Boring Day?

Let's Code

Angry Parent Simulator

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

Functions

What are functions?

Functions

  • Functions are simple sets of instructions!

  • 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")

Let's Code

Simple Functions

Let's Code

Bring It Home!

Homework

Read: https://javascript.info/function-expressions + Tasks 

Read: https://javascript.info/arrow-functions-basics + Tasks

Read:https://github.com/thejsway/thejsway/blob/master/manuscript/chapter04.md

Do: Delete the JS and do it again for all assignments