How to use JavaScript's try...catch statements for error handling?

JavaScript's try...catch statements are used for error handling by enclosing the code that may potentially throw an error within the try block. If an error occurs within the try block, it is caught and handled in the catch block.

Here is the syntax for using try...catch statements in JavaScript:

try {
  // Code that may throw an error
} catch (error) {
  // Code to handle the error
}

The code that may throw an error is placed within the try block.
If an error occurs within the try block, the control flow jumps to the catch block.
The catch block receives the error object as a parameter (often named error, err, or e) which contains information about the error.
Inside the catch block, you can perform actions to handle the error, such as logging an error message, displaying a friendly error to the user, or recovering from the error.

Here is an example of using try...catch for error handling:

try {
  // Code that may throw an error
  const result = nonExistentVariable; // Throws an error
  console.log(result); // This line will not execute
} catch (error) {
  // Code to handle the error
  console.log('An error occurred:', error.message);
}

In this example, the statement const result = nonExistentVariable; tries to assign a value to a non-existent variable, which throws a ReferenceError. The control flow then jumps to the catch block, and the error object is logged to the console with the error message.

It's important to note that when an error is thrown within a try block, the execution of the try block is immediately stopped, and the control flow moves to the catch block. Therefore, any code after the error-causing line inside the try block will not execute.