Programming Paradigms

What are programming paradigms?Programming Paradigms are general style forbuilding computer programs. Over time, paradigms and languages haveevolved to create more elegant code

Four paradigms we’re going over1. Imperative2. Functional3. Object Oriented Programming4. Dynamic languages

ImperativeOldest.Tell the computer how to do things.Heavy use of if and loops.Most programming that we did in Snap wasimperative.Most languages support imperativeprogramming.

FunctionalMost modernAlso considered declarativeTells the computer what to do and not how todo it.F#, Scala, Lisp, Haskell, Erlang, Clojure

Imperative vs Functional

var numbers = [1,2,3,4,5];var squaredNumbers = []; for (var i=0; i<numbers.length; i++) { var number = numbers[i]; squaredNumbers.push(number *number);}

var numbers = [1,2,3,4,5]; var squaredNumbers =numbers.map(function(i) { return i*i;});

Code that squares numbers in a list (JavaScript)

Imperative Functional

Object Oriented ProgrammingModel code into components that representreal constructus (objects, nouns, verbs) in thereal world.Typical object is a Customer object withproperties that define/describe a customer andactions that a customer may take.Java, C#, C++, Ruby, Python

Object Oriented Programmingpublic class Customer{ public string Name {get;set;} public void MakePurchase();}

Dynamic ProgrammingCode where type checking of data types isweak or non existent.May interchange types at will.var orderFood = function(food) {

//Food can be any type like when customer orders offmenu by number or name}JavaScript, Ruby, Python