The nullish coalescing operator (??) is a logical operator that returns its right-hand side operand when its left-hand side operand is null or undefined and otherwise returns its left-hand side operand.
The logical OR operator (II) is an operator that returns the right-hand side operand if the left operand is any falsy value, not only null or undefined.

const foo= null ?? "string"; 
console.log(foo);
// expected output: "string"

const number @ ?? 42; 
console.log(number); 
// expected output: 0

const number1 @ ?? 12; 
console.log(number1); 
//expected output 0

const number2= 0 || 12; 
console.log(number2); 
//expected output 12 Because || operator is a logical operator
 and boolean value for 0 is false