Dig1108 Lesson 3


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Dig1108 Lesson 3

  1. 1. INTRO TO SERVER SIDE PROGRAMMING Lesson Three Friday, September 13, 13
  2. 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 Friday, September 13, 13
  3. 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); Friday, September 13, 13
  4. 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 - $deductions ); Friday, September 13, 13
  5. 5. Programming Blocks Blocks are sections of code grouped together Blocks consist of declarations and statements PHP organizes statements into blocks with { } Conventions dictate indentation for readability {$foo=$bar+$bat;echo $foo;} { $foo = $bar + $bat; echo $foo; } Friday, September 13, 13
  6. 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 Friday, September 13, 13
  7. 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"; } Friday, September 13, 13
  8. 8. ASSIGNMENT 3.1 Good Code, Bad Code Friday, September 13, 13
  9. 9. Good Code, Bad Code Log in to Github, then into Cloud9 Using 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-4.1.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) Friday, September 13, 13
  10. 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 Friday, September 13, 13
  11. 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" Friday, September 13, 13
  12. 12. ASSIGNMENT 3.2 fetch and merge Friday, September 13, 13
  13. 13. Let's Merge Again In Cloud 9: git remote add upstream https://github.com/vc-dig1108-fall-2013/assignments.git git fetch upstream git merge upstream/master Open the file named "homework-4.1.md" Add your name to bottom of the file and save Commit the file & push to your Github acct. (hint: "origin") https://help.github.com/articles/create-a-repo https://help.github.com/articles/fork-a-repo Friday, September 13, 13