ShawonAshraf

const docToUpdate = { name: 'Halo MCC' };
const updateTerm = { $set: { name: 'Halo Master Chief Collection' } };

console.log('Before update :');
let haloMcc = await db.collection('games').findOne(docToUpdate);
console.log(haloMcc);

await updateDoc(db, docToUpdate, updateTerm);

// check

ShawonAshraf

// filter
const filter = {
  name: 'Red Dead Redemption 2',
  platform: 'XBOXONE'
};
await deleteDoc(db, filter);

const deleteDoc = async(db, filter) => {
  try {
    await db.collection('games').findOneAndDelete(filter);

ShawonAshraf

let adder = DoubleAdder()
print(adder.add(a: 34.67, b: 89.23)) // 123.9

ShawonAshraf

class DoubleAdder: Adder {
    typealias Number = Double
    
    func add(a: Double, b: Double) -> Double {
        return a + b
    }
}

ShawonAshraf

func add(a: Double, b: Double) -> Double {
    return a + b
}

ShawonAshraf

class DoubleAdder: Adder {
    typealias Number = Double
}

ShawonAshraf

protocol Adder {
    associatedtype Number
    func add(a: Number, b: Number) -> Number
}

ShawonAshraf

let adder = IntAdder()
print(adder.add(a: 55, b: 45)) // prints 100

ShawonAshraf

class IntAdder: Adder {
    func add(a: Int, b: Int) -> Int {
        return a + b
    }
}

ShawonAshraf

protocol Adder {
    func add(a: Int, b: Int) -> Int
}