JavaScript Nullish Coalescing Operator

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• Introduced in ES2020.
• It works with the concept of nullish values (null/undefined) instead of fasly values.
• Values of 0, '', or false are NOT nullish values, but they are falsy.

restaurant.numGuests = 0;
const guests1 = restaurant.numGuests || 10;
console.log(guests1); // 10
 
// Nullish: null and undefined (NOT 0, false or '')
const guestCorrect = restaurant.numGuests ?? 10;
console.log(guestCorrect); // 0