TypeScript String Prototype Property

Last Updated : 15 Jul, 2025

The Prototype Property in TypeScript which is used to add properties and methods to an object.
Syntax:

string.prototype

Return Value: This method does not returns any value.
Below examples illustrate the String Prototype property in TypeScript
Example 1:

JavaScript

function Person(name:string, job:string, yearOfBirth:number)
    {    
        this.name= name; 
        this.job= job; 
        this.yearOfBirth= yearOfBirth; 
    } 
    
      
    // Driver code
    var emp = new Person("Smith", "ABC",12214) 
    
    // This will show Person's prototype property.  
    console.log(emp.prototype);

Output:

Example #2:

JavaScript

function Person(name:string, job:string, yearOfBirth:number)
    {    
        this.name= name; 
        this.job= job; 
        this.yearOfBirth= yearOfBirth; 
    } 
    
    // Driver code
    var emp = new Person("Smith", "ABC",12214) 

    // This will show Person's prototype property. 
    Person.prototype.email = "abc@123.com"; 
     
    console.log("Person's name: " + emp.name); 
    console.log("Person's Email ID: " + emp.email);