JS Practice — Built-in Objects

Object.is() — same value returns true

📖 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() — identical primitives

For most values, Object.is(a, b) behaves the same as ===. Two identical primitives return true.

Challenge: Implement sameValue(a, b) that returns Object.is(a, b).

sameValue(1, 1)       // → true
sameValue('x', 'x')  // → true

💡 Hints (1)

• For most values, `Object.is` and `===` agree. The exceptions are `NaN` and `±0`.