Illumination on JavaScript Prototypes - The Diigo Meta page

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  • Dynamic Prototype Modification

     

    The objects you use for your prototypes are just normal objects. If you modify them then the changes are immediately visible in any other objects that were constructed with that prototype object. So using the prototype object baseProto by calling the constructor constructorFn9 from the previous example: 

      <script>  // set up dynam with a hidden prototype pointer to baseProto  var dynam = new constructorFn9();    function testadd() {  baseProto.testfn = function() { alert('testfn exists!'); };  }   function testdel() {  delete baseProto.testfn;  }    function testcall() {  if (typeof dynam.testfn == 'function') {  dynam.testfn();  } else {  alert('testfn doesnt exist on dynam!');  }  } </script> &nbsp; // set up dynam with a hidden prototype pointer to baseProto&nbsp; var dynam = new constructorFn9();&nbsp; &nbsp; function testadd() {&nbsp; baseProto.testfn = function() { alert('testfn exists!'); };&nbsp; }&nbsp;&nbsp; function testdel() {&nbsp; delete baseProto.testfn;&nbsp; }&nbsp; &nbsp; function testcall() {&nbsp; if (dynam.testfn) {&nbsp; dynam.testfn();&nbsp; } else {&nbsp; alert('testfn doesnt exist on dynam');&nbsp; }&nbsp; }&nbsp;
• 10 May 10
  

  Navneet Kumar

  JavaScript Prototype Inheritance

  • the only way you can set the hidden prototype reference in JavaScript is to use the new operator.
  • Only when you use the new keyword in conjunction with the function does the prototype property get used in a special way
  • The only way to set the hidden prototype reference is to use the new keyword in conjuntion with a constructor function.
  • A constructor function is just a normal function, with a property called prototype set to the parent prototype object you want to use.

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