Thinkful DC - Intro to JavaScript

Intro to Javascript
February 2018
Wiﬁ: MakeOfﬁces 5Ghz
Password: Internet!23
http://bit.ly/js-intro-dc
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Instructor
TJ Stalcup
Lead Mentor @Thinkful (3yr)
API Evangelist @WealthEngine (3y)
JS Developer (22y)
Pokemon Master
TAs
WiFi: MakeOfﬁces 5Ghz / Internet!23 2

About you
What's your name?
What brought you here today?
What is your programming experience?
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WiFi: MakeOfﬁces 5Ghz / Internet!23

About Thinkful
Thinkful helps people become developers and data
scientists through 1-on-1 mentorship and project-based
learning
These workshops are built using this approach.These workshops are built using this approach.
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Take advantage of our support
Don't get discouraged, struggle leads to masterystruggle leads to mastery
Don't be shy, take full advantage of our supporttake full advantage of our support

Agenda
Learn key Javascript concepts (30 min)
Go over assignments (10 min)
Complete assignments with our support! (30 min)
Go over answer key (10 min)
Steps to continue learning (10 min)

How the web works
Type a URL from a client (e.g. google.com)
Browser sends an HTTP request asking for specific files
Browser receives those files and renders them as a website

Client/Servers
Client (sends requests)
Frontend Developer
Manages what user sees
Server (sends response)
Backend Developer
Manages what app does
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WiFi: MakeOfﬁces 5Ghz

Example: facebook.com
Client Server
Open browser
and navigate to
facebook.com
HTML, CSS, &
Javascript render
newsfeed
Request
Response
Algorithm
determines
content of feed.
Sends back
HTML, CSS,
Javascript ﬁles
Application LogicApplication Logic
Initial requestInitial request
Following responseFollowing response
We'll be writing Javascript, the code
that the browser uses to run the app
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History of Javascript
Written by Brendan Eich in 1995 for Netscape
Initial version written in 10 days
Completely unrelated to Java, but maybe named after it to
draft off its popularity
Over 10 years, became default programming language for
browsers
Continues to evolve under guidance of ECMA International,
with input from top tech companies

Javascript today
Has large community of developers, libraries and
frameworks
Lots of job opportunities
Also the syntax is easier to understand for ﬁrst-time
developers
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Real developers use Google... a lot

Deﬁning a variable with Javascript
var numberOfSheep = 20
Initialize variable
Name of variable
Value of variable

Variable examples
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JSBin.com
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Declaring a function with Javascript
function greet() {
return "Hello world!";
}
Initialize function Name of function
What the function does
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Parameters within functions
function adder(a, b) {
return a + b;
}
adder(1,2);
Parameters in declaration
Parameters used
within the function
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Examples of parameters within functions
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JSBin.com
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Repl.it setup & ﬁrst steps!
http://bit.ly/tf-intro-js-challenges

if/else Statements
go to gas stationkeep driving
if false if true
need gas?
family roadtrip

Comparing Values
== (equal to)
5 == 5 --> true
5 == 6 --> false
!= (not equal to)
5 != 5 --> false
5 != 6 --> true
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if/else Statements
function familyRoadtrip() {
if (needGas == true) {
getGas();
}
else {
keepDriving();
}
}
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if/else Statements
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JSBin.com
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Exercise Solutions
http://bit.ly/intro-js-solutions
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Thinkful DC - Intro to JavaScript

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