Error Handling with Try/Catch

Errors happen. Programs can trip over missing values or bad math.

try and catch let you handle a problem without crashing the whole show.

Think of a safety net under a trampoline.

try

Put risky code inside try.

JavaScript will attempt it.

catch

If try fails, catch runs.

The error object can tell you what happened.

finally

finally runs after try and catch.

Use it for cleanup that should always happen.

throw

Use throw to make your own error on purpose.

That is useful when a value is not allowed.

Why this helps kids of all ages

Without catch, one bad line can stop everything.

With catch, you can show a friendly message and keep going.

Tip: Catch real problems. Do not hide every error forever. Fix the cause when you can.