Class 10 Arrays
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This document provides an agenda for a class on arrays. It includes discussions on system analysis and design approaches like the SAAD model, an introduction to arrays, and an assignment and project involving arrays. The project is a battleship game where students will use 2D arrays to set up a game board and track shots for two players. It also outlines practice exercises for students to work on arrays and provides resources for working on the related assignment and project.
![Creating and Accessing Arrays
Single Dimension
a = Array.new # an empty array
a = [] # same as above
puts a => nil (no output)
a[0]=“hello” # assigns the value
a[1]=“ world”
puts a[0] + a[1]
puts a
x = [1,”green”,”martian”]](https://image.slidesharecdn.com/class10lecturenotes-101124133754-phpapp02/85/Class-10-Arrays-10-320.jpg)
![Array Properties and Methods
Properties
a=[“hello”, 1, “world”,2,”!”]
a.last => “!”
a.first => “hello”
a[0].class => String
a[1].class => Fixnum
a.at(1) => 1
a.length => 5](https://image.slidesharecdn.com/class10lecturenotes-101124133754-phpapp02/85/Class-10-Arrays-11-320.jpg)
![Array Properties and Methods
Methods
a.push (“my friend”) => [ “hello”, 1,
“world”,2,”!”,”my friend”]
a.pop => [ “hello”, 1, “world”,2,”!”]
a.sort => [1,2, “!”,”hello”,”world”]
a.reverse = [“!”,2,”world”,1,”hello”]
a.sort! => applied to array (permanent change)
a.delete_at(2) => [ “hello”, 1, 2,”!”]
a.each do |variable|
end => iterates through the array](https://image.slidesharecdn.com/class10lecturenotes-101124133754-phpapp02/85/Class-10-Arrays-12-320.jpg)
![2-Dimensional Arrays
Creating
x=Array.new(4) {Array.new(7)}
a=[[1,"green"],[2,"red"],[3,"blue"]]
Accessing & Assigning
myval= a[1][0] => “green”
x[2][4]=“Halifax”
a[1][1]=“orange”](https://image.slidesharecdn.com/class10lecturenotes-101124133754-phpapp02/85/Class-10-Arrays-14-320.jpg)
![Iterating Through Arrays
Using for
rows=5
cols=5
countr=0
for x in (0..rows-1)
for y in (0..cols-1)
mtrx[x][y]=countr
countr=countr+1
end
end](https://image.slidesharecdn.com/class10lecturenotes-101124133754-phpapp02/85/Class-10-Arrays-16-320.jpg)
Class 10 Arrays
- 1. Class 10 – Arrays
- 2. Agenda Lateral Thinking Warm-up Project 1 Results, Issues Discussion: SAAD - Problem Solving with Code Discussion/Demo: Intro to Arrays Intro to Assignment 7: Daily Agenda Intro to Project 2: Battleship Task assignment Rubric Project Work and Wrap-up
- 3. System Analysis & Design Problem Solving with Code Tools IPO (outside in) Pseudocode (linear, integrative) Flowchart (linear, integrative) Models & Approaches SDLC 3-tier (n-tier) MVC (OOP)
- 4. SAAD – 3-tier (n-tier) Presentation Logic Data
- 5. SAAD - MVC Model View Controller
- 6. MVVM – the NeXt Generation Model View View-Model Data Binding Service Structure
- 7. MVC, N-Tier, MVVM – who cares? Moving towards OOP Clean division of work between functional units Example: Calculator Converter: Model? View? Controller? Project 2 – later tonight…
- 8. Intro to Arrays What is an array? A collection of related data Similar to a set of mailboxes at a site The site is the array, each mailbox represents an element The mailbox may contain a specific value or object The contents can be strings, integers, or even another array Addressed using brackets or parentheses (zero- based) Can be examined iteratively or uniquely
- 9. Arrays Illustrated Single Dimension Array=days_of_week(7) 2-Dimensional (table) Array=address_book(4,7) Mon Tues Wed Thurs Fri Sat Sun fname lname addr city prov post Email joe smith 123 My Street Halifax NS B1B 1B1 joe@test.com jane jones 1 Main Dr Dartmouth NS B7B 7B7 jane@mymail.com pat white 21 Goode Dr. Halifax NS B1A 2C3 pat@hotmail.com sam davis 19 Smith Dr. Timberlea NS B9G 2K8 sam@mailstop.com
- 10. Creating and Accessing Arrays Single Dimension a = Array.new # an empty array a = [] # same as above puts a => nil (no output) a[0]=“hello” # assigns the value a[1]=“ world” puts a[0] + a[1] puts a x = [1,”green”,”martian”]
- 11. Array Properties and Methods Properties a=[“hello”, 1, “world”,2,”!”] a.last => “!” a.first => “hello” a[0].class => String a[1].class => Fixnum a.at(1) => 1 a.length => 5
- 12. Array Properties and Methods Methods a.push (“my friend”) => [ “hello”, 1, “world”,2,”!”,”my friend”] a.pop => [ “hello”, 1, “world”,2,”!”] a.sort => [1,2, “!”,”hello”,”world”] a.reverse = [“!”,2,”world”,1,”hello”] a.sort! => applied to array (permanent change) a.delete_at(2) => [ “hello”, 1, 2,”!”] a.each do |variable| end => iterates through the array
- 13. Creating and Accessing Arrays Practice Handout: Exercise 10-1, Creating and Accessing an Array
- 14. 2-Dimensional Arrays Creating x=Array.new(4) {Array.new(7)} a=[[1,"green"],[2,"red"],[3,"blue"]] Accessing & Assigning myval= a[1][0] => “green” x[2][4]=“Halifax” a[1][1]=“orange”
- 15. Iterating Through Arrays Using each rows=5 cols=5 countr=0 mtrx=Array.new(rows) {Array.new(cols)} mtrx.each do |myvar| myvar.each do |ovar| ovar=countr countr=countr+1 end end
- 16. Iterating Through Arrays Using for rows=5 cols=5 countr=0 for x in (0..rows-1) for y in (0..cols-1) mtrx[x][y]=countr countr=countr+1 end end
- 17. Creating and Accessing Arrays Practice Handout: Exercise 10-2, Creating and Accessing a multi-dimensional Array
- 18. Assignment 7: Daily Agenda Use a 2D Array to hold details Prompt for time (hour only) Prompt for appointment Prompt for location Assign inputs to elements Continue to prompt until user types in a blank in the time slot Sort the Agenda and then generate Daily Agenda by iterating through the array
- 19. Project 2: Battleship Simple Version 8 x 8 grid (A-H, 1-8) 2 ships each player Each ship assigned to a particular grid location 10 shots each player A shot to the location of a vessel sinks it Draw grid and results after each shot “~” is unknown, “!” is sunk, “0” is a miss If two of the ships of any player are sunk, the other player wins, end game If after ten shots one player has more ships than the other, he/she wins, otherwise it’s a tie.
- 20. Wrap-up Summary Arrays Analysis & Design Assignment Project Next Week Brief intro to Classes Business Problems with Fishbone Diagram Project Time*
- 21. Practice/ Set-up Use this time to attempt the assignment to prepare you for the project, OR Begin to set up your tasks, OR See me about any issues with grades, etc. OR Do any research you need to get the assignment or project completed. GREAT TIP SITE: http://www.techotopia.com/index.php/Understanding_
Editor's Notes
- #6: Model: The model contains the core information for an application. This includes the data and validation rules as well as data access and aggregation logic. View: The view encapsulates the presentation of the application, and in ASP.NET this is typically the HTML markup. Controller: The controller contains the control-flow logic. It interacts with the Model and Views to control the flow of information and execution of the application.