Advanced Input/output

There are other ways for input/output in JavaScript besides prompt and console.log. Here are a few examples:

  1. Reading from a file: You can read input from a file using the built-in fs module in Node.js. Here's an example:

const fs = require('fs');

// Read input from a file
fs.readFile('input.txt', 'utf8', (err, data) => {
  if (err) throw err;
  console.log(data);
});

  1. Writing to a file: You can write output to a file using the fs module as well. Here's an example:

const fs = require('fs');

// Write output to a file
fs.writeFile('output.txt', 'Hello, world!', (err) => {
  if (err) throw err;
  console.log('Output written to file!');
});

  1. Using HTML forms: If you're working with JavaScript in a web environment, you can use HTML forms to get input from users and display output to them. Here's an example:

<!DOCTYPE html>
<html>
  <head>
    <title>Input/output example</title>
  </head>
  <body>
    <form>
      <label>Enter your name:</label>
      <input type="text" id="nameInput">
      <button type="button" onclick="sayHello()">Say hello</button>
    </form>
    <p id="output"></p>
    <script>
      function sayHello() {
        const name = document.getElementById('nameInput').value;
        document.getElementById('output').innerText = `Hello, ${name}!`;
      }
    </script>
  </body>
</html>

This example uses an HTML form to get the user's name, and a JavaScript function to display a greeting message to them. The output is displayed in a <p> element with the ID "output".

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