look up asciii value javascript

Looking Up ASCII Values in JavaScript#

If you're working with strings in JavaScript, you may need to find the ASCII value of a particular character. The ASCII (American Standard Code for Information Interchange) table assigns a numerical value to each letter, number, and symbol that can be represented on a computer.

Method 1: Using the charCodeAt() Method#

One way to find the ASCII value of a character in JavaScript is to use the charCodeAt() method. This method returns the Unicode value (which is the same as the ASCII value for characters in the basic ASCII range) of the character at a specified index in a string. Here's an example:

const myString = "Hello, World!";
const myChar = myString.charCodeAt(0);

console.log(myChar); // Output: 72

In this example, we're assigning the string "Hello, World!" to a variable called myString. We then use the charCodeAt() method to find the ASCII value of the first character in the string (which is the letter "H"). The ASCII value of "H" is 72, so that's what gets logged to the console.

Method 2: Using the fromCharCode() Method#

Another way to work with ASCII values in JavaScript is to use the fromCharCode() method. This method takes one or more character codes and returns the corresponding string. Here's an example:

const myChar = String.fromCharCode(72);

console.log(myChar); // Output: "H"

In this example, we're using the fromCharCode() method to convert the ASCII value 72 to the corresponding character (which is "H"). We then assign that character to a variable called myChar and log it to the console.

Using Highlight.js for Syntax Highlighting#

To make the code examples in this post easier to read, I'm using the Highlight.js library for syntax highlighting. This library adds CSS classes to code blocks that can be styled to highlight different programming languages. Here's an example of how to use Highlight.js with a <pre> and <code> block:

<pre><code class="language-javascript">
const myString = "Hello, World!";
const myChar = myString.charCodeAt(0);

console.log(myChar); // Output: 72
</code></pre>

In this example, we're wrapping our code block in a <pre> tag and a <code> tag with the class "language-javascript". This tells Highlight.js to apply JavaScript syntax highlighting to the code block.