The Deep Vault holds 2000-year-old crystal formations — but touching the wrong one triggers an ancient trap! 💎 In Crystal Cavern you learned to .sort() them. Now you need to ASK QUESTIONS: does this vault CONTAIN a blue crystal? (.some()) Are ALL crystals worth over 100? (.every()) The Crystal Scanner gives true or false in milliseconds — and the wrong answer seals the cavern FOREVER!
💎 What we're MAKING today: My Crystal Scanner
In Crystal Cavern you used .sort() to re-order crystals.
Today you meet two new superpowers that don't change or remove anything — they just
ask a yes/no question about the whole cave!
.some() — scans the vault and answers: "Is there AT LEAST ONE crystal like this?"
It stops the moment it finds one. .every() — scans and answers:
"Do ALL crystals match?" It stops the moment one breaks the rule. Both return
true or false — a single answer for the whole collection!
🔗 Last time (Crystal Cavern) you re-ordered crystals with .sort(). Today: no crystals are moved or changed — you're just asking questions. 5 crystals in, 1 TRUE/FALSE answer out. That's the Scanner! 💎
scanner.jsJavaScript
💡 Tap a query type below — watch the code line change LIVE!.some() / .every() → true / false
crystal vaultLIVE
💎 SCANNER READY
🔍 CRYSTAL SCANNER
Tap a query, then press ▶ Scan Vault — the Scanner tells you TRUE or FALSE!
↢ Crystals
5
Result
—
🏅 Rank
Apprentice
Challenge 1 / 5
Vault Alert! Check if any crystal is worth over 200…
🧩 Choose ONE query to run PICK ONE
🧠 Which scanner reads the vault correctly? TAP ONE
💎 The Scanner checks every crystal and returns TRUE or FALSE. The code line updates the moment you pick a query!
📋 Your 5 Crystal Challenges
0 of 5 challenges scanned
💎
You Mastered Crystal Scanner!
Two questions, instant answers — you navigated the Deep Vault like a true Crystal Guardian. The ancient seals stay open and the treasures are safe! 🔮
💫 What You Learned
.some() — Asks "Is there AT LEAST ONE item that passes my test?" Returns true if any match, stops early
.every() — Asks "Do ALL items pass my test?" Returns true only if every single one passes, stops on first fail
Both return a single true/false — a yes-or-no answer for the whole cave
Together with .filter(), .map(), .sort(), .find(), you now have the complete toolkit for answering any question about an array!
Real coders use .some()/.every() to check permissions, validate forms, and test game rules — now you do too! 💎
💎 Your Creation
My Crystal Scanner
💎 Come Back Tomorrow!
Next up: Neon Beacon — a new universe! You'll build a real-time display that tracks scores, highlights leaders, and updates live as data changes. Think: a sports scoreboard powered by JavaScript! ⚡