!true will become false. !0 will become true. !'' will become true. Think of this operator as saying “This item is NOT true” or “This item is NOT false”.const car = { make: 'Honda', model: 'Accord', year: 1998 };
console.log('make' in car);
// expected output: true
delete car.make;
if ('make' in car === false) {
car.make = 'Suzuki';
}
console.log(car.make);
// expected output: "Suzuki"(IN) operator in sql like "OR" operator
For example:
Select * From employees
Where department_id "IN" (60,90);