Javascript - API Fun

Leon Noel

#100Devs

"I'm not a magician, but I'll mystify yah.

I'm super hot, but you can call me mister fire.

If you never seen me battle, well then you missed the fire."

Agenda

  • Questions? 

  • Let's Talk -  #100Devs

  • Review - Objects

  • Learn - Basic APIs

  • Homework - Build APIs

Questions

About last class or life

Checking In

Like and Retweet the Tweet

!checkin

No Networking Until May

Client Deadline: May 3rd

Client Alternatives

Grassroots Volunteer*

Free Software / Open Source

https://www.firsttimersonly.com/

!youtube

!Merch

THANK YOU

Programming

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.

JAVASCRIPT

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 - Lost Galaxy

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 - Chats Choice

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

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'

Let's Code

EVERYBODY! SHOTS! SHOTS! SHOTS!

Let's Code

NASA PHOTOS

Homework

Do: Make the cocktailDB api work with spaces between the names!
Do: Find three APIs and build three simple apps using those APIs (Not all of these work, but it is a start: https://github.com/public-apis/public-apis)
Do: Codewars Daily!
Do: Anki Daily!