optional chaining

Safely access nested object properties without throwing errors using the optional chaining operator.

Explanation

• obj?.prop: Returns undefined if obj is null or undefined, otherwise returns obj.prop.
• obj?.method?.(): Safely calls a method only if it exists.
• obj?.[key]: Safely accesses dynamic properties using bracket notation.

Usage

To safely access nested properties, use the optional chaining operator:

const user = {
  name: 'John',
  address: {
    street: '123 Main St',
    city: 'New York'
  }
};

// Safe property access
console.log(user?.address?.street); // '123 Main St'
console.log(user?.phone?.number); // undefined (no error)

// Safe method calls
user?.getName?.(); // undefined (no error if method doesn't exist)

// Safe array access
const users = [{ name: 'Alice' }];
console.log(users?.[0]?.name); // 'Alice'