JS Lesson 9

lesson9.js

function A() {
  this.value = 2;
}

//Property is explicitly set and cannot be changed directly
Object.defineProperty(A, "noValueChange", {
  configurable: false, //This value cannot be changed or directly deleted
  enumerable: false, //This property will not not be listed with other properties
  writable: false, //This property cannot be assigned a new value
  value: "NoValue" //The value
});

//Property can be read and written to (assigned a value)
Object.defineProperty(A, "changeableValue", {
  get: function() {
    return this.value;
  },
  set: function(newValue) {
    this.value = newValue;
  }
});

//A read-only property with a computed value
Object.defineProperty(A, "valueSquared", {
  get: function() {
    return this.value ^ 2; //Returns a computed value
  }
});
      
//A write-only property with a computed value
Object.defineProperty(A, "valueMultiplied", {
  set: function(value) {
    this.value *= value; //Sets a computed value
  }
});