Databases
StackOverflow2013
Postsdbo
POJavaScript OOP in NodeJS: how?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POJavaScript OOP in NodeJS: how?
    primarykey
    data
    text
    <p>I am used to the classical OOP as in Java.</p> <p>What are the best practices to do OOP in JavaScript using NodeJS? </p> <p>Each Class is a file with <code>module.export</code>?</p> <p>How to create Classes?</p> <pre><code>this.Class = function() { //constructor? var privateField = "" this.publicField = "" var privateMethod = function() {} this.publicMethod = function() {} } </code></pre> <p>vs. (I am not even sure it is correct)</p> <pre><code>this.Class = { privateField: "" , privateMethod: function() {} , return { publicField: "" publicMethod: function() {} } } </code></pre> <p>vs.</p> <pre><code>this.Class = function() {} this.Class.prototype.method = function(){} ... </code></pre> <p>How would inheritance work?</p> <p>Are there specific modules for implementing OOP in NodeJS? </p> <p>I am finding a thousand different ways to create things that resemble OOP.. but I have no clue what is the most used/practical/clean way.</p> <p><strong>Bonus question</strong>: what is the suggested "OOP style" to use with MongooseJS? (can a MongooseJS document be seen as a Class and a model used as an instance?)</p> <p><strong>EDIT</strong></p> <p>here is an example in <a href="http://jsfiddle.net/eS7LE/4/">JsFiddle</a> please provide feedback.</p> <pre><code>//http://javascriptissexy.com/oop-in-javascript-what-you-need-to-know/ function inheritPrototype(childObject, parentObject) { var copyOfParent = Object.create(parentObject.prototype) copyOfParent.constructor = childObject childObject.prototype = copyOfParent } //example function Canvas (id) { this.id = id this.shapes = {} //instead of array? console.log("Canvas constructor called "+id) } Canvas.prototype = { constructor: Canvas , getId: function() { return this.id } , getShape: function(shapeId) { return this.shapes[shapeId] } , getShapes: function() { return this.shapes } , addShape: function (shape) { this.shapes[shape.getId()] = shape } , removeShape: function (shapeId) { var shape = this.shapes[shapeId] if (shape) delete this.shapes[shapeId] return shape } } function Shape(id) { this.id = id this.size = { width: 0, height: 0 } console.log("Shape constructor called "+id) } Shape.prototype = { constructor: Shape , getId: function() { return this.id } , getSize: function() { return this.size } , setSize: function (size) { this.size = size } } //inheritance function Square(id, otherSuff) { Shape.call(this, id) //same as Shape.prototype.constructor.apply( this, arguments ); ? this.stuff = otherSuff console.log("Square constructor called "+id) } inheritPrototype(Square, Shape) Square.prototype.getSize = function() { //override return this.size.width } function ComplexShape(id) { Shape.call(this, id) this.frame = null console.log("ComplexShape constructor called "+id) } inheritPrototype(ComplexShape, Shape) ComplexShape.prototype.getFrame = function() { return this.frame } ComplexShape.prototype.setFrame = function(frame) { this.frame = frame } function Frame(id) { this.id = id this.length = 0 } Frame.prototype = { constructor: Frame , getId: function() { return this.id } , getLength: function() { return this.length } , setLength: function (length) { this.length = length } } /////run var aCanvas = new Canvas("c1") var anotherCanvas = new Canvas("c2") console.log("aCanvas: "+ aCanvas.getId()) var aSquare = new Square("s1", {}) aSquare.setSize({ width: 100, height: 100}) console.log("square overridden size: "+aSquare.getSize()) var aComplexShape = new ComplexShape("supercomplex") var aFrame = new Frame("f1") aComplexShape.setFrame(aFrame) console.log(aComplexShape.getFrame()) aCanvas.addShape(aSquare) aCanvas.addShape(aComplexShape) console.log("Shapes in aCanvas: "+Object.keys(aCanvas.getShapes()).length) anotherCanvas.addShape(aCanvas.removeShape("supercomplex")) console.log("Shapes in aCanvas: "+Object.keys(aCanvas.getShapes()).length) console.log("Shapes in anotherCanvas: "+Object.keys(anotherCanvas.getShapes()).length) console.log(aSquare instanceof Shape) console.log(aComplexShape instanceof Shape) </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USfusio
    1. USfusio
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POJavaScript OOP in NodeJS: how?
      1. USAndrzej Duś
      1. VTFavorite
    2. VO
      singulars
      1. POJavaScript OOP in NodeJS: how?
      1. USClaudiuIO
      1. VTFavorite
    1. COThere is nothing really _specific_ about OO JS in node.js. There is just OO JS. Your question is about _translating_ Java OOP techniques to JS, which is just _not right_. I think it better you spent the same time/energy in learning how JS's prototype-based model works, and how you can use it to your advantage
      singulars
      1. POJavaScript OOP in NodeJS: how?
      1. USElias Van Ootegem
    2. COAlso, you don't have classes in JavaScript. You can create class-like behaviour with functions, but it's generally not a good idea.
      singulars
      1. POJavaScript OOP in NodeJS: how?
      1. USm_vdbeek
    3. COAs for inheritance, every method declared in prototype will be accessible by instances of your "Class" object but also children of "Class".
      singulars
      1. POJavaScript OOP in NodeJS: how?
      1. USm_vdbeek
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload