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Node.js prompt.addProperties() Method

Last Updated : 25 Oct, 2020

The prompt.addProperties() method is an asynchronous function and this method is used to add properties to an existing object from the command line. This function is used for I/O operations.

Syntax:

prompt.addProperties(object, Array[keys], callbackfunction)

Parameters: This method takes three parameters as shown below:

object: The first parameter is an object which is predefined in the program.
Array: The second parameter is the keys to the given object.
callback function: callback function to make this function is an asynchronous function.

Installation Module:

You can visit the link to Install this module. You can install this package by using this command.
```
npm install prompt
```
After that, you can just create a folder and add a file for example, index.js. To run this file you need to run the following command.
```
node index.js
```

Project:

Filename index.js

const prompt = require('prompt'); 
  
// Start the prompt 
prompt.start(); 
  
// Create an object 
const user = { 
    name: 'GFG', 
    country: 'India'
}; 
  
// Extending the `user` object 
prompt.addProperties(user, ['email', 'age'], (err, user) => { 
    if (err) { 
        throw err; 
    } 
  
    // Printing modified object 
    console.log(user); 
  
});

Step to run this program:
Run the index.js file using the following command:

node index.js

Input:

[email protected]
prompt: age: 12

Output:

prompt: email:  [email protected]
prompt: age:  12
{ name: 'GFG', country: 'India', email: '[email protected]', age: '12' }

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