Handling Errors in JavaScript using the Try Catch Statement

Handling errors in JavaScript using the try catch statement. Learn how you can create a smarter JavaScript program by using the try catch statement. The try and catch statements are a group of statement that allows you to control what happens when JavaScript encounter an error

Learn how you can create a smarter JavaScript program by using the try catch statement.

As you write your JavaScript application, there will be times when you will unexpectedly hit an error. The error might be caused by unexpected user input, a fault in the code, or a server response timeout.

For example, you can cause an error by calling a function you haven’t defined in your code:

printFn();
// Error: printFn is not defined

The kind of error above will cause JavaScript to crash and stop further code execution.

printFn(); // code below this line won't get executed

console.log("Hello there");

The try and catch statements are a group of statement that allows you to control what happens when JavaScript encounter an error just like the one above. Here’s how the code recipe looks like:

try {
  // code...
} catch (err) {
  // error handling
}

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JavaScript values are allocated when things are created (objects, Strings, etc.) and freed automatically when they are no longer used. This process is called Garbage collection.