JavaScript Logical Assignment Operators

// Logical Assignment Operators  
const rest1 = {  
  name: "Capri",  
  numGuests: 20,  
};  
const rest2 = {  
  name: "La Piazza",  
  owner: "Giovanni Rossi",  
};  
// Set default number if numGuests doesn't exist  
// OR assignment operator  
rest1.numGuests = rest1.numGuests || 10; // 20  
rest2.numGuests = rest2.numGuests || 10; // 10  
// Logical  
rest1.numGuests ||= 10; // 20  
rest2.numGuests ||= 10; // 10  
// Nullish assignment operator (null or undefined)  
// Logical  
rest1.numGuests ??= 10;  
rest2.numGuests ??= 10;  
// AND assignment operator  
rest1.owner = rest1.owner && "<ANONYMOUS>"; // 'undefined'  
rest2.owner = rest2.owner && "<ANONYMOUS>"; // '<ANONYMOUS>'  
// Logical  
rest1.owner &&= "<ANONYMOUS>"; // nothing happens since rest1.owner isn't true  
rest2.owner &&= "<ANONYMOUS>"; // '<ANONYMOUS>'