Try...Catch

Relax. We'll talk through this in plain words — no textbook voice.

Try...Catch statements are used to handle runtime errors. When an error occurs, they let you handle it gracefully instead of crashing the program.

🛡️ Structure:

• try {}: Code that might fail

• catch(error) {}: Handle errors

• finally {}: Always runs

javascript

// Basic try-catch
try {
    const result = 10 / 0;
    console.log(result); // Infinity (not error in JS)
    
    // This will cause error
    const x = y + 5; // y is not defined
} catch (error) {
    console.log(`Error caught: ${error.message}`);
}

// Try-catch with finally
function divideNumbers(a, b) {
    try {
        if (b === 0) {
            throw new Error("Cannot divide by zero");
        }
        return a / b;
    } catch (error) {
        console.log(`Error: ${error.message}`);
        return null;
    } finally {
        console.log("Division operation completed");
    }
}

console.log(`Result: ${divideNumbers(10, 2)}`);
divideNumbers(10, 0);

// Catching specific errors
try {
    JSON.parse("invalid json");
} catch (error) {
    if (error instanceof SyntaxError) {
        console.log("Invalid JSON format");
    }
}

You should see

Error caught: y is not defined Result: 5 Division operation completed Error: Cannot divide by zero Division operation completed Invalid JSON format