How to use Exception Handling in JS 🤯
Exception handling is a mechanism in programming that allows you to handle and manage errors or unexpected events that occur during the execution of your code.
Try-Catch Block
1. *try*: The code that might throw an exception is wrapped in a `try` block.
2. *catch*: The `catch` block contains the code that will be executed if an exception is thrown in the `try` block.
Example
try {
// Code that might throw an exception
const result = 10 / 0;
console.log(result);
} catch (error) {
// Handle the exception
console.error("An error occurred:", error.message);
}
Types of Exceptions
1. *Synchronous exceptions*: Occur during the execution of synchronous code.
2. *Asynchronous exceptions*: Occur during the execution of asynchronous code (e.g., promises, async/await).
Best Practices
1. *Keep try blocks small*: Minimize the code in the `try` block to avoid catching unnecessary exceptions.
2. *Handle specific exceptions*: Catch specific exceptions instead of catching all exceptions.
3. *Provide meaningful error messages*: Include descriptive error messages to help with debugging.
Throwing Exceptions
1. *throw*: Use the `throw` statement to throw an exception.
2. *Error objects*: Create error objects with a meaningful message and name.
Example
function divide(a, b) {
if (b === 0) {
throw new Error("Cannot divide by zero");
}
return a / b;
}
try {
const result = divide(10, 0);
console.log(result);
} catch (error) {
console.error("An error occurred:", error.message);
}
Finally Block
1. *finally*: The `finally` block contains code that will be executed regardless of whether an exception was thrown.
Example
try {
// Code that might throw an exception
} catch (error) {
// Handle the exception
} finally {
// Code that will be executed regardless of exceptions
console.log("Cleanup code");
}
By using exception handling, you can write more robust and error-resistant code that provides a better user experience.
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