ho-js.4.js

ho-js.4.js

/*
 If you don't want something mutable to remain mutable, create a new context.
*/
const createBasket = (externalMutable) => {
    const privateConstant = 123; 
    let privateMutable = 'abc'; 
      return {
        get getValues(){ // New context
          return {privateConstant, privateMutable, externalMutable};
        }, 
        set setValue (value) {  // New context
          privateMutable = value; 
          console.log({privateConstant, privateMutable, externalMutable}); 
        }
      }; 
}

let mutatingValue = 128; 
const basket = createBasket(mutatingValue); 

basket.getValues;      // {privateConstant: 123, privateMutable: "abc", externalMutable: 128} 
basket.setValue = 987; // {privateConstant: 123, privateMutable: 987, mutable: 128}
basket.getValues;      // {privateConstant: 123, privateMutable: 987, mutable: 128}