proposal-value-objects.js

//Value objects

//Motivation

//Use cases

//Proposed syntax

value Money {
  constructor(amount, currency) {
    this.amount = amount;
    this.currency = currency;
  }
}
const twoDollars = Money(2, '$');
const oneDollar = Money(1, '$');


//Equality is defined by their properties
twoDollars.equals(oneDollar) // false
twoDollars.equals(twoDollars) // true

//Changeless
twoDollars.amount = 4; // throws exception

//Lack causal powers. 
//Values can only be measured, compared and related. Methods can only return new value or boolean.
twoDollars.updateEntity(account) // throws exception

//Concept of instance does not exist for values

new Money(1, '$') // throws exception 
Money(1, '$') // all good

//FAQ