4. A getter failing to delete itself

A getter failing to delete itself


  • I ran across this snippet, a lazy getter for energy of creeps/structures/etc. However, whoever wrote it left out the second half of the lazy part, so it deletes itself without recreating the property. For some reason I cannot fathom, the property doesn't get deleted, so it's still there when I try to access it a second time. Why does that work?

     

    Object.defineProperty(RoomObject.prototype, "energy", {
    get: function () {
    delete this.energy;
    if (this.storeCapacity) {
    return this.store.energy;
    } else if (this.energyCapacity) {
    return this.energy;
    } else if (this.carryCapacity) {
    return this.carry.energy;
    } else {
    return undefined;
    }
    },
    configurable: true
    });