JS Practice — Built-in Objects

Object.is() — different values return false

📖 Usage Example

// Strict identity that handles edge cases
Object.is(NaN, NaN)   // → true  (unlike ===)
Object.is(0, -0)      // → false (unlike ===)
Object.is(1, 1)       // → true

Use Object.is() for strict value comparison that correctly handles NaN equality and distinguishes +0 from -0.

Object.is() — not the same value

When two values are different, Object.is returns false — just like ===.

Challenge: Implement differentValues(a, b) that returns true when Object.is(a, b) is false.

differentValues(1, 2) // → true
differentValues(1, 1) // → false

💡 Hints (1)

• Negate `Object.is(a, b)` to test for inequality.