The prototype property allows to add new properties and methods to the existing JavaScript object types. There are two examples to describe the JavaScript String prototype property.
Syntax:
object.prototype.name = value
Return Value: It returns a reference to the String.prototype object.
Example 1: This example adds a property salary to the all objects.
<!DOCTYPE HTML> <html>   <head>     <title>         JavaScript String prototype Property     </title> </head>   <body style="text-align:center;">       <h1>GeeksForGeeks</h1>           <p id="GFG_UP"></p>       <button onclick="GFG_Fun();">         Click Here     </button>           <p id="GFG_DOWN"></p>           <script>         var up = document.getElementById('GFG_UP');         var down = document.getElementById('GFG_DOWN');                   function person(name, age) {             this.name = name;             this.age = age;         }         var p1 = new person("p1", 24);         up.innerHTML = "Click on the button to add "                 + "a new property to all objects of"                 + " a given type.< br > "                 + JSON.stringify(p1);           function GFG_Fun() {             person.prototype.salary = 1000;             down.innerHTML = p1.salary;         }     </script> </body>   </html> |
Output:
Example 2: This example adds a method info to the all objects.
<!DOCTYPE HTML> <html>   <head>     <title>         JavaScript String prototype Property     </title> </head>   <body style="text-align:center;">       <h1>GeeksForGeeks</h1>       <p id="GFG_UP"></p>       <button onclick="GFG_Fun();">         Click Here     </button>           <p id="GFG_DOWN"></p>           <script>         var up = document.getElementById('GFG_UP');         var down = document.getElementById('GFG_DOWN');         function person(name, age) {             this.name = name;             this.age = age;         }         var p1 = new person("p1", 22);         up.innerHTML = "Click on the button to add"                 + " a new property to all objects "                 + "of a given type.< br > "                 + JSON.stringify(p1);           function getData(name, age) {             return "Information of person <br>Name - '"                         + name + "'<br>Age - " + age;         }           function GFG_Fun() {             person.prototype.info                     = getData(p1.name, p1.age);                                   down.innerHTML = p1.info;         }     </script> </body>   </html> |
Output:
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