Lesson 18 — Error handling

Catch errors instead of crashing

When code throws an error, everything stops — unless the error happens inside try { }. Then JavaScript jumps to catch (e) { }, where e.message is the error's text. finally { } runs at the end either way, which is good for clean-up.

try { risky(); } catch (e) { console.log(e.message); } finally { console.log("done"); }

Why it matters: one bad value should show a friendly message, not a blank page.