dohoonk

Practicing Markdown with Gist

this is just for testing

Styling Text

this is normal text. This is bold text, this is italic text and this is strike-through text. This is a link to google

puts "Hellow Word"

dohoonk

Ruby Review

General Purpose Programming Language Interpreted Language

object_id

a = "Hello"
b = "World"

dohoonk

Unix commands

pwd- user

whami- shows the user

ls- list

ls -a (all)(shows hidden files)

dohoonk

Arrays

<< (shovle operator)

.push

the main differnece between the above two is that .push allows multi variables to be pushed into an array not in a form of another array

.include?

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Hash

me = {"Me" => "Tony"} key => Value (pairs)

me["Me"] me.fetch("Me","unkown") <---- second arguement is the default value to return

my_hash = Hash.new my_hash = Hash.new(0)

dohoonk

Arguements

multiply(a, *b) <---- multiple arguements

Blocks

yield if block_given?

Procs & Lambdas

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Sinatra

HTTP verbs HTTP URL

GET / (homepage) POST /about (about part of your application) PATCH/PUT /info.html /data.json /articles/15 DELETE

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Render vs. Redirect

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SQL

sqlite3 first.db

relational database

must define names of table and number of colums

dbbrowser sqlitebroweser.org

dohoonk

#SQL

One to Many

one student <<<<<<<<<<<<<<<< many projects

One to One

one student <<<<<<<<<<<<<<<< single profile