Why is JavaScript prototype property undefined on new objects?

by

Only constructor functions have prototypes. Since x is a constructor function, x has a prototype.

b is not a constructor function. Hence, it does not have a prototype.

If you want to get a reference to the function that constructed b (in this case, x), you can use 

b.constructor

More Related Contents:

  1. Prototypical inheritance – writing up [duplicate]
  2. What are the nuances of scope prototypal / prototypical inheritance in AngularJS?
  3. What is the reason to use the ‘new’ keyword at Derived.prototype = new Base
  4. Javascript object members that are prototyped as arrays become shared by all class instances
  5. Defining methods via prototype vs using this in the constructor – really a performance difference?
  6. Assigning prototype methods *inside* the constructor function – why not?
  7. Multiple inheritance/prototypes in JavaScript
  8. JS : Convert Array of Strings to Array of Objects
  9. ES6 arrow functions not working on the prototype?
  10. Asynchronous operations in constructor
  11. Extending an Object in Javascript
  12. Javascript when to use prototypes
  13. Create a reset of javascript Array prototype when Array.prototype has been modified?
  14. Grasping prototypical Inheritance through pseudoclassical instantiation (JavaScript)
  15. Can I construct a JavaScript object without using the new keyword?
  16. Understanding Crockford’s Object.create shim
  17. How to access object prototype in javascript?
  18. ‘this’ keyword, not clear
  19. Adding Prototype to JavaScript Object Literal
  20. Function.prototype is a function
  21. Javascript: hiding prototype methods in for loop?
  22. Can you create functions with custom prototypes in JavaScript?
  23. Advantages of setting the “constructor” Property in the “prototype”
  24. JavaScript Event prototype in IE8
  25. ‘this’ is undefined in JavaScript class methods
  26. JavaScript: What are .extend and .prototype used for?
  27. JS defineProperty and prototype
  28. [[Prototype]] vs prototype: ..what is the difference? (MyCons.__proto__ === MyCons.prototype) equals FALSE
  29. prototypal inheritance concept in javascript as a prototype based language
  30. ES6 – declare a prototype method on a class with an import statement

Leave a Comment