DIG1108C Lesson3 Fall 2014
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This document provides a recap of key concepts from Lesson Three of an introductory server-side programming course, including data types, operators, programming blocks, coding conventions, and an assignment on analyzing code style. It discusses literals, arithmetic, comparison, and string operators. It also covers programming blocks, coding conventions for readability, and basic Git commands. The assignment asks students to analyze examples of good and bad code based on style and conventions.
![Basic git Commands
• git branch - what branches are there & which am I on?
• git status - what files have I changed or created?
• git add (files) - consider this stuff for remembering
• git commit (files) - I really want you to remember what I've considered via git add
• git push [remote [branch] ] - tell the robot named "remote" (default is "origin") about
my changes in "branch" (default is "master")
• git fetch [remote] - ask the robot named "remote" for changes or branches that you
don't know about yet
• git merge [branch] - attempt to combine changes in "branch"](https://image.slidesharecdn.com/dig1108c-lesson3-fall2014-140909101047-phpapp02/85/DIG1108C-Lesson3-Fall-2014-11-320.jpg)
DIG1108C Lesson3 Fall 2014
- 1. Intro To Server Side Programming Lesson Three
- 2. Recap - What Have We Found? • Literals • boolean - True/False • integer • float - decimal numbers • string - text • array - ordered key/value pairs • object - literal within class • Null - no value
- 3. Recap Continued • Operators • Arithmetic - $newvalue = $oldvalue + 1; • Assignment - $newervalue = 10; • Comparison - $newvalue != $oldvalue; • String Operators var_dump('foo' . 'bar'); $a = 'foo'; a .= 'bar'; var_dump($a);
- 4. Order of Operations • PHP (and most languages) follows Operator Precedence rules • These allow for unambiguous statements • Parentheses can be used to override default Operator Precedence or to add visual clarity $taxable_income = $wages + $earnings - $deductions; $taxable_income = $wages + ( $earnings - $deductions );
- 5. Programming Blocks • Blocks are sections of code grouped together • Blocks consist of declarations and statements • PHP organizes statements into blocks with { } • Conventions dictate indentation for readability {$foo=$bar+$bat;echo $foo;} { $foo = $bar + $bat; echo $foo; }
- 6. Coding Conventions • A set of guidelines for a specific programming language of recommended styles, practices & methods for each aspect of a program • Covers things like file organization, indentation, comments, declarations, statements, white space, naming conventions, practices & principles • This improves the readability of code and makes software maintenance easier. • Conventions enforced by humans, not compilers
- 7. Ease of Reading/Ease of Use • $UP=6;DN=19;$x=0; while(++$x<=24){echo "hour $x: "; if($x>+$UP&&$X<+$DN); echo "sun is up"; else echo "sun is down": echo "n"; } • define( 'SUNRISE', 6 ); define( 'SUNSET', 19 ); $hours = range( 1, 24); foreach ( $hours as $hour ) { // ternary operation $up_or_down = ( ( $hour >= SUNRISE and $hour <= SUNSET ) ? 'up' : 'down' ); echo "hour {$hour}: ", "sun is {$up_or_down}", "n"; }
- 8. Assignment 3.1 Good Code, Bad Code
- 9. Good Code, Bad Code • Log in to Github • Look through your forked projects for a block (~100) lines of code that are either very hard or very easy to read based on the coding style • Copy & paste into a file named assignment-3.1.md • Make a list with your partner of ways that the code style could be improved in each of your examples • Save files to share with the class. Push to Github? (https:// help.github.com/articles/create-a-repo)
- 10. Git and Github - Here to Help • Git is your robot friend that remembers what you tell it to remember, and only that • This robot recognizes when things have changed • It knows how to remember, just not when • Git can tell you what changed and when, you use comments to tell it (and yourself) why • If you ask nicely (-h or --help) the robot will help • This robot is well organized and can track branches of changed code
- 11. Basic git Commands • git branch - what branches are there & which am I on? • git status - what files have I changed or created? • git add (files) - consider this stuff for remembering • git commit (files) - I really want you to remember what I've considered via git add • git push [remote [branch] ] - tell the robot named "remote" (default is "origin") about my changes in "branch" (default is "master") • git fetch [remote] - ask the robot named "remote" for changes or branches that you don't know about yet • git merge [branch] - attempt to combine changes in "branch"