<h1>Checking if a command line argument is set</h1>
<p>When working with command line arguments in a program, it is important to properly handle and validate them. One common task is to check if a specific argument has been set by the user. In this article, we will explore different ways to check if a command line argument is set using HTML tags formatting.</p>
<h2>What are command line arguments?</h2>
<p>Command line arguments are values provided by the user when running a program from the command line. They are used to pass information to the program at runtime. These arguments can be optional or required, and they can be used to customize the behavior of the program.</p>
<p>For example, if we have a program that calculates the area of a circle, we can pass the radius of the circle as a command line argument. This would allow us to calculate the area of different circles without having to modify the code of the program each time.</p>
<h2>Checking if a command line argument is set using HTML tags formatting</h2>
<p>Now let's dive into the different ways we can check if a command line argument is set using HTML tags formatting.</p>
<h3><code><pre></code> tag</h3>
<p>The <code><pre></code> tag is commonly used to display preformatted text, such as code. It can also be used to display the command line arguments passed to a program. To check if a specific argument is set, we can use the <code><pre></code> tag to display the arguments and then use the <code>indexOf()</code> method to check if the argument is present. If the method returns a value greater than 0, it means the argument is present.</p>
<p>Example:</p>
<code><pre>
var args = process.argv;
if(args.indexOf("-r") > 0) {
console.log("Radius argument is set");
}
</pre></code>
<h3><code><ul></code> and <code><li></code> tags</h3>
<p>The <code><ul></code> and <code><li></code> tags are commonly used to create unordered lists. We can use them to display the command line arguments and then use the <code>includes()</code> method to check if a specific argument is present. If the method returns <code>true</code>, it means the argument is present.</p>
<p>Example:</p>
<code><ul>
var args = process.argv;
if(args.includes("-r")) {
console.log("Radius argument is set");
}
</ul></code>
<h3><code><table></code> and <code><tr></code> tags</h3>
<p>The <code><table></code> and <code><tr></code> tags are commonly used to create tables. We can use them to display the command line arguments and then use the <code>find()</code> method to check if a specific argument is present. If the method returns a value, it means the argument is present.</p>
<p>Example:</p>
<code><table>
var args = process.argv;
if(args.find(arg => arg === "-r")) {
console.log("Radius argument is set");
}
</table></code>
<h2>Conclusion</h2>
<p>In this article, we have explored different ways to check if a command line argument is set using HTML tags formatting. It is important to properly handle and validate command line arguments to ensure the correct behavior of a program. By using HTML tags, we can easily display and manipulate the arguments to check for a specific one. Happy coding!</p>
