Extract a Number from a String with JavaScript
User input from HTML form fields is generally provided to JavaScript as a string. We've lived with that fact for decades but sometimes developers need to extract numbers from that string. There are multiple ways to get those numbers but let's rely on regular expressions to extract those numbers!
To employ a regular expression to get a number within a string, we can use \d+:
const string = "x12345david";
const [match] = string.match(/(\d+)/);
match; // 12345
Regular expressions are capable of really powerful operations within JavaScript; this practice is one of the easier operations. Converting the number using a Number() wrapper will give you the number as a Number type.
![Create Spinning Rays with CSS3: Revisited]()
![Introducing MooTools Templated]()
One major problem with creating UI components with the MooTools JavaScript framework is that there isn't a great way of allowing customization of template and ease of node creation. As of today, there are two ways of creating:
new Element Madness
The first way to create UI-driven...
![DWRequest: MooTools 1.2 AJAX Listener & Message Display]()
Though MooTools 1.2 is in its second beta stage, its basic syntax and theory changes have been hashed out. The JavaScript library continues to improve and become more flexible.
Fellow DZone Zone Leader Boyan Kostadinov wrote a very useful article detailing how you can add a...
![Save Web Form Content Using Control + S]()
We've all used word processing applications like Microsoft Word and if there's one thing they've taught you it's that you need to save every few seconds in anticipation of the inevitable crash. WordPress has mimicked this functionality within their WYSIWYG editor and I use it...
the code
string.match(/(\d+)/);assumes that a match is found. If no number is present in the string,string.match(/(\d+)/)will return null, and attempting to destructure null will result in an error