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Editorial Team
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Asked: 2026-06-06T03:10:02+00:00

Why does this work…. function Person(name) { this.name = name; } Person.prototype.speak = function()

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Why does this work….

function Person(name) {
   this.name = name;
  }


Person.prototype.speak =  function() {
   alert(this.name);
}


var person = new Person("fred");

person.speak();

But not this..

function Person(name) {
   this.name = name;
        speak =  function() {
   alert(this.name);
}


var person = new Person("fred");

person.speak();

I am not understanding how inheritance works, or the javascript “prototype-chain”.

Thanks.

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1 Answer

  1. Editorial Team
    function Person(name) {
   this.name = name;
        speak =  function() {
   alert(this.name);
}

    should be

    function Person(name) {
   this.name = name;
   this.speak = function () {
      alert(this.name);
   };
}
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