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JavaScript Error Handling

JavaScript Error Handling is the process of catching and handling runtime errors that occur in your code. JavaScript provides several methods and techniques for handling errors, including try-catch statements, throw statements, and finally blocks.

Here is an example of using a try-catch statement in JavaScript:

try {
  let result = 100 / 0;
  console.log(result);
} catch (error) {
  console.error(error);
}

In the example, the code inside the try block attempts to divide 100 by 0, which will cause an error. The catch block is used to catch the error and display an error message. In this case, the error message "Division by zero" is logged to the console.

Here is another example of using the throw statement in JavaScript:

function checkAge(age) {
  if (age < 18) {
    throw new Error("Age must be 18 or older");
  } else {
    console.log("Age is valid");
  }
}

checkAge(17); // Uncaught Error: Age must be 18 or older

In the example, the checkAge function is used to check if the age passed as an argument is less than 18. If the age is less than 18, the function throws an error with the message "Age must be 18 or older". The error can be caught using a try-catch statement, or it will be displayed in the console as an uncaught error.

Error handling is an important aspect of JavaScript programming, as it allows you to handle errors gracefully and provide helpful error messages to users. Understanding error handling and how to use try-catch statements, throw statements, and finally blocks is an important part of JavaScript programming and web development.



Next: JavaScript Timers and Asynchronous Code

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