JavaScript Try..Catch

JavaScript Errors - Try and Catch

The try...catch statement is representing a block of statements. The block is used to try expressions, and specify a response if an exception is thrown.

The try statement is testing a code block for errors.

The catch statement is where you take care of and handle the error.

The throw statement is where you can create custom errors.

The finally statement executes code after try and catch. This is done regardless of the result.

JS JavaScript - JavaScript Errors - Invalid or unexpected token

try {
    eval('alert("Hello bumblebee)');
catch(error) {
    // Result: SyntaxError: Invalid or unexpected token

Learn more about JavaScript Errors

Some exception messages might vary depending on the browser being used.

JavaScript - Finally

The finally statement can be used for closing a resource.

JS JavaScript - Try..Catch - Finally

try {
// Write the file to disk.
finally {
    // Close the resource

Learn more about JavaScript Debugging Learn more about JavaScript Developer Tools

Error Name Values

There are six different values that can be returned by the name property for an error.

EvalError That creates an instance that represents an error that occurs regarding the global function eval().

InternalError That creates an instance that represents an error that occurs when an internal error in the JavaScript engine is thrown.

RangeError That creates an instance that represents an error that occurs when a numeric variable or parameter is outside of its valid range.

ReferenceError That creates an instance that represents an error that occurs when de-referencing an invalid reference.

SyntaxError That creates an instance that represents a syntax error that occurs while parsing code in eval().

TypeError That creates an instance that represents an error that occurs when a variable or parameter is not of a valid type.

URIError That creates an instance that represents an error that occurs when encodeURI() or decodeURI() are passed invalid parameters.


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JS JavaScript: Debugging

Searching for bugs and fixing them is called code debugging.

The bugs might be difficult to diagnose and therefore it is important to have a good approach to find and fix the bugs effectively.

JS JavaScript: Math Object

JavaScript Math object enables mathematical tasks on numbers. 
The properties and methods of Math are static and can be called without creating the Math object.

JS JavaScript: Conditions

A condition is an expression that evaluates whether something is true or false. Conditions are very much used. Usually the code should execute one way if the condition is true and another way if the condition is false.


JavaScript is one of the 3 core language technologies of the World Wide Web that all web developers must learn:

1.      HTML to define the content of web pages.

2.      CSS to specify the layout of web pages.

3.      JavaScript to program the behavior of web pages.

JavaScript is a scripting or programming language that allows you to implement complex things on web pages. Every time a web page does more than just sit there and display static information for you to look at, displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc. − you can bet that JavaScript is probably involved.

The benefits of using JavaScript are:

1.      You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.

2.      Immediate feedback to the visitors − They don't have to wait for a page reload to see if they have forgotten to enter something.

3.      Increased interactivity − You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.

4.      Richer interfaces − You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.


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The NDC Conferences (Norwegian Developers Conference) are one of the world`s largest independent software conferences for .NET & Agile development. The conference covers everything you need to know within software development. The conferences are held each year in many places such as Oslo, Copenhagen, London, Sydney and Minnesota.

Update Conference Prague

Update Conference Prague is the biggest developer conference in the Czech Republic. The conference is offering sessions delivered by the top experts from all around the world. Their goal is to inspire the attendees and enrich their knowledge.

Troy Hunt

Learn about Web Security from Troy Hunt. He is a really engaged speaker that frequently give talks on conferences around the world. Troy is a Microsoft MVP and you can even learn from him on some great courses on Pluralsight.

W3Schools is a great education Web Site for learning web technologies. On W3Schools you may find well organized basic to advanced tutorials and references.

Scott Hanselman

Learn about Web Technologies and new trends from Scott Hanselman. Scott Hanselman is an author of developer books and he is an engaged speaker that usually talks about the Microsoft stack. You may meet Scott on conferences around the world.

Developer Week

DeveloperWeek is one of the world’s largest developer conferences. Developer Week focus on new dev technologies, the conference have talks and workshops for newbies and experienced audience. You can attend on a Developer Week conference different places in Nothern America.


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