[Design Pattern] Value Object
Problem to Solve
Reparesent a value that is immutable and distinct from other objects based on its properties rather than its identity.
Solution
Create a class where instances are considered equal if all their properties are equals and ensure the object is immutable.
Use cases
Representing complex data types like money, coordinates, or dates.
Code
Class Money {
constructor(amount, currency) {
this.amount = amount
this.currency = currency
// Freeze the object to make it immutable
Object.freeze(this)
}
equals(other) {
return other instanceof Money &&
this.amount === other.amount &&
this.currency = other.currency;
}
}
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