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Lesson 2 — let and const
let and const
Both create variables. Use let when the value will change later, and const when it should stay fixed. Prefer const by default — it prevents accidental changes.
Why it matters: choosing const makes your intent clear and catches bugs where a value changes by mistake.
Watch out: a const cannot be reassigned, so use let for counters and running totals.
Want it another way?
Task
Create a const city = "Paris" and log: I live in Paris
Run your code — when the output matches the task, you will see a green check. Then mark the lesson complete.
Test your knowledge
Test your knowledgeA quick 3-question quiz on this lesson — instant feedback.