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Advanced Functional Programming with Scala - Notes

Copyright © 2017 Fantasyland Institute of Learning. All rights reserved.

1. Mastering Functions

A function is a mapping from one set, called a domain, to another set, called the codomain. A function associates every element in the domain with exactly one element in the codomain. In Scala, both domain and codomain are types.

val square : Int => Int = x => x * x

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Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

• Stores data elements based on an sequential, most commonly 0 based, index.
• Based on tuples from set theory.

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EXAMPLE:

(keystone-v3-setup.sh script will perform first few steps using role 'admin')

# Create a domain named d1 (note use of --os-url and --os-token to manage keystone)

anc@u128:~$ openstack --os-url http://u132.localdomain:5000/v3 --os-identity-api-version 3 --os-token=ADMIN domain create d1
+---------+----------------------------------------------------------------------------------------+
| Field   | Value                                                                                  |
+---------+----------------------------------------------------------------------------------------+

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;; your original change_fun

(defun change_fun (fun x)
    (cond ((eq fun 'sin) (list 'cos x))
        ((eq fun 'cos) (list '- 0 (list 'sin x)))
        ((eq fun 'tan) (list '+ 1 (list '* (list 'tan x) (list 'tan x))))
        ((eq fun 'log) (list '/ 1  x))
     (T
        (error "Not a function! ~S " fun)))
)