Programming paradigm

Click here to load reader

  • date post

    01-Nov-2014
  • Category

    Technology

  • view

    322
  • download

    1

Embed Size (px)

description

Talks about different programming paradigms, their strengths & weakness, evolution of programming paradigms and some real life application of how companies have gained competitive advantage by using right paradigm to solve their problems.

Transcript of Programming paradigm

  • 1. Programming Paradigms Bhavin Kamani
  • 2. Cuisine
  • 3. Music Genre
  • 4. Imperative Programming Instructional Command Variable State Conditions Loops
  • 5. Direct Efficient Inflexible Side Effects
  • 6. Assembly, C COBOL, Visual Basic
  • 7. Object Oriented Programming
  • 8. Abstraction Maintainibility Learning Curve Over Engineering
  • 9. C++, Java, C# Ruby, Python
  • 10. Declarative Programming "What" instead of "How" Reduced Side effects Order of statements not crucial
  • 11. Domain Specific Languages SQL
  • 12. Domain Specific Languages Regular Expression
  • 13. Functional Programming
  • 14. Composability Concurrency Learning Curve Main stream support
  • 15. LISP, Haskell, Erlang Closure, Scala, F#
  • 16. Multi-Paradigm Programming
  • 17. http://www.99-bottles-of-beer.net JavaScript
  • 18. Lyrics 99 bottles of beer on the wall, 99 bottles of beer. Take one down and pass it around, 98 bottles of beer on the wall. 98 bottles of beer on the wall, 98 bottles of beer. Take one down and pass it around, 97 bottles of beer on the wall. 97 bottles of beer on the wall, 97 bottles of beer. Take one down and pass it around, 96 bottles of beer on the wall. -------------------------------------------------------------------------- -------------------------------------------------------------------------- 1 bottle of beer on the wall, 1 bottle of beer. Take one down and pass it around, no more bottles of beer on the wall. No more bottles of beer on the wall, no more bottles of beer. Go to the store and buy some more, 99 bottles of beer on the wall.
  • 19. Imperative Style var lyrics = []; for (var bottles = 99; bottles > 0; bottles--) { lyrics.push(bottles + " bottles of beer on the wall, " + bottles + " bottles of beer"); var next_bottles = ((bottles-1) == 0 ? "no more" : (bottles-1)); lyrics.push("Take one down and pass it around, " + next_bottles + " bottles of beer on the wall."); } var zero_bottle = "No more"; lyrics.push(zero_bottle + " bottles of beer on the wall, " + zero_bottle + " bottles of beer"); lyrics.push("Go to the store and buy some more, " + "99 bottles of beer on the wall."); document.writeln(lyrics.join("
    "));
  • 20. Object-Oriented Style varBottleSong=function(num_bottles,stanza){ this.num_bottles=num_bottles; this.stanza=stanza; }; BottleSong.prototype={ sing:function(separator){ varbeer_form="bottlesofbeer"; for(varbottles=this.num_bottles;bottles>0;bottles--){ this.stanza.addLine(bottles+beer_form+"onthewall,"+bottles+beer_form); varnext_bottles=((bottles-1)==0?"nomore":(bottles-1)); this.stanza.addLine("Takeonedownandpassitaround,"+next_bottles+beer_form+"onthewall."); } varzero_bottle="Nomore"; this.stanza.addLine(zero_bottle+beer_form+"onthewall,"+zero_bottle+beer_form); this.stanza.addLine("Gotothestoreandbuysomemore,"+this.num_bottles+beer_form+"onthewall."); returnthis.stanza.write(separator); } } varStanza=function(){ this.lines=[]; }; Stanza.prototype={ addLine:function(line){ this.lines.push(line); }, write:function(separator){ returnthis.lines.join(separator); } } varsong=newBottleSong(99,newStanza()); document.writeln(song.sing("
    "));
  • 21. Functional Style var BottleSong = function(num_bottles){ var bottles = function(n){ return (n == 0 ? "no more" : n) + " bottles"; } this.num_bottles = num_bottles; this.last_stanza = function(){ return ["No more bottles of beer on the wall, no more bottles of beer.", "Go to the store and buy some more, 99 bottles of beer on the wall."]; } this.stanza = function(n) { var line = [bottles(n) + " of beer on the wall, " + bottles(n) + " of beer."]; line.push("Take one down and pass it around, " + bottles(n-1) + " of beer on the wall."); return line; } } BottleSong.prototype = { sing: function(separator){ var bottles = _.range(this.num_bottles,0,-1) var that = this; return _.reduce(bottles, function(lyrics, n) { return lyrics.concat(that.verse_n(n)); },[]).concat(that.verse_0()).join(separator); } } var song = new BottleSong(99); document.writeln(song.sing("
    "));
  • 22. bottles 0 = "no more bottles" bottles 1 = "1 bottle" bottles n = show n ++ " bottles" verse 0 = "No more bottles of beer on the wall, no more bottles of beer.n" ++ "Go to the store and buy some more, 99 bottles of beer on the wall." verse n = bottles n ++ " of beer on the wall, " ++ bottles n ++ " of beer.n" ++ "Take one down and pass it around, " ++ bottles (n-1) ++ " of beer on the wall.n" main = mapM (putStrLn . verse) [99,98..0] Haskel Solution
  • 23. (defn bottles-str [n] (str (cond (= 0 n) "no more bottles" (= 1 n) "1 bottle" :else (format "%d bottles" n)) " of beer")) (defn print-bottle [n] (println (format "%s on the wall, %s." (bottles-str n) (bottles-str n))) (println "Take one down and pass it around," (bottles-str (dec n)) "on the wall.")) (defn sing [n] (dorun (map print-bottle (reverse (range 1 (inc n))))) (println "No more bottles of beer on the wall, no more bottles of beer.") (println "Go to the store and buy some more," (bottles-str n) "on the wall.")) (sing 99) Clojure Solution
  • 24. Piet Solution
  • 25. Whitespace Solution
  • 26. Paradigm Evolution
  • 27. Java 8 Lambda Expression