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million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Javascript “Not a Constructor” Exception while creating objects up vote 24 down vote favorite 4 I am defining an object like this: function Project(Attributes, ProjectWidth, ProjectHeight) { this.ProjectHeight = ProjectHeight; this.ProjectWidth = ProjectWidth; this.ProjectScale = this.GetProjectScale(); this.Attributes =

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Attributes; this.currentLayout = ''; this.CreateLayoutArray = function() {....} } I then try to create and instance like this: var newProj = new Project(a,b,c); But this execption is thrown: Project is not a constructor What could be wrong? I googled around a lot, but still can't figure out what I am doing wrong. javascript object constructor typeerror share|improve this question edited Apr 11 '12 at 13:52 Rob W 205k32468461 asked Apr 11 '12 at 13:44 unni 1,03511017 Out of curiosity, which browser is giving that "Project is not a constructor" message? –Dagg Nabbit Apr 11 '12 at 13:54 8 As an unrelated side node, general JavaScript style guidelines recommend starting a variable identifier with an uppercase letter only if it is a constructor: "Project" is okay, but the leading capital in "ProjectHeight" suggests to me that it should also be a constructor. If you use "projectHeight" instead, your code will be more readable to others. (In fact, if other pos

con... Introduction to Objects II Forum View Course » View Exercise 298 points Submitted by Sundar Nadimpalli over 3 years ago I get an error: TypeError: Penguin is not a object is not a constructor react native constructor Here is my code: // the original Animal class and sayName method function

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Animal(name, numLegs) { this.name = name; this.numLegs = numLegs; } Animal.prototype.sayName = function() { console.log("Hi my name is "+this.name); }; // es6 class is not a constructor define a Penguin class var Penguin = new Object(); // set its prototype to be a new instance of Animal Penguin.prototype = new Animal(); var penguin = new Penguin('Pandu', 2); penguin.sayName(); Not sure what http://stackoverflow.com/questions/10107198/javascript-not-a-constructor-exception-while-creating-objects I am doing wrong. Can anyone help? 3 votes permalink Your use of "function Penguin() {} " instead of "var Penguin = new object()" works because Penguin shouldn't be an object. A function can be a constructor, but an Object is more like directly programming the data. Think of how you used a constructor to make a penguin object. You put something like: penguin = new Penguin("Ralph") That creates the https://www.codecademy.com/en/forum_questions/51c030438c1ccc9475009acf object "penguin" with properties of penguin.name = "Ralph" penguin.numLegs = 2 penguin.sayname = a function that makes it print "My name is Ralph" The reason that even a blank penguin function (like your example) still works is because of that prototype line, it's basically saying: Penguin is just like the animal class, and everything that makes up the animal class is used to make up the Penguin class, unless overriden directly. Basically, you created Penguin as a blank function, and also told it to inherit all the properties from Animal, so it's not really blank anymore. 382 points Submitted by Michael Scott over 3 years ago 1 Comment Sundar Nadimpalli over 3 years ago Thank you for the explanation. Clears up my doubts regarding this. So this is the right way to do it. 2 votes permalink To answer the initial question.. the error was that they made Penguin an Object, instead of a function/class/constructor. 382 points Submitted by Michael Scott over 3 years ago 1 vote permalink Ok I was able to solve the problem by looking at exercise 6. If I define the new Penguin like this: function Penguin() { } Instead of like this: var Penguin = new Object(); Codeacademy lets me

class="p">(foo, http://raganwald.com/2014/07/09/javascript-constructor-problem.html class="nx">bar) { this._foo = foo; this._bar = bar; } var snafu = new Fubar("Situation Normal", "All Fsked Up"); When you “call” the constructor with the new keyword, you get a new object allocated, and the constructor is called with the new object as the not a constructor current context. If you don’t explicitly return anything from the constructor, you get the new object as the result. Thus, the body of the constructor function is used to initialize the newly created object. There’s another thing: The newly created object is initialized to have a prototype. What prototype? The contents of the constructor’s prototype property. So we can write: Fubar.prototype.concatenated = function () { return this._foo + " " + this._bar; } snafu.concatenated()

 

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