JavaScript: [] == ![] is TRUE?!PRO

An empty array equals NOT itself: == turns both sides into the number 0. Use === instead.

// [] == ![] is TRUE ?!
// ![] is false (an array is truthy). Then == converts both sides to numbers:
// [] → "" → 0 and false → 0, so 0 == 0.
console.log([] == ![]);    // true ?!

console.log(![]);          // false
console.log(Number([]));   // 0
console.log(Number(false)); // 0
console.log([] === ![]);   // false ✓ === never converts types

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