Get and Set with JavaScript

getSetter.js

var o = {
  set item (str) {
    return this.log[this.log.length] = str;
  },
  get item () {  
    if (this.log.length > 0) {  
      return this.log[this.log.length - 1];  
    }  
    else {  
      return null;  
    }  
  },
  log: []
}