Javascript常见的DRY编程习语

Question

var veryLongObjectName = {};
// ...


if (!veryLongObjectName["verylongpropertyName"]) 
      veryLongObjectName["verylongpropertyName"] = 0;

if (veryLongObjectName["verylongpropertyName"]++) 
      console.log("I've seen it already");

我想通过改变最后两行来使上面的代码更简洁;我怎么能实现呢？

Answer 1

使用引用怎么样。

var veryLongObjectName = {};
var prop = veryLongObjectName["verylongpropertyName"];

if (!prop) 
    prop = 0;

if (prop++) 
    console.log("I've seen it already");

Answer 2

如果他们打扰你，为什么不为你的物品和道具制作简易手柄：

var prop = 'longpropertyname';
var obj = longObjectName;
// do whatever you want with obj[prop]

Answer 3

var veryLongObjectName = {};
var obj = veryLongObjectName;
var prop = "verylongpropertyName";

if (!obj[prop]) obj[prop] = 0;

if (obj[prop]++) console.log("I've seen it already");

或创建一个函数来处理你想要的事情：

function checkProp(obj, prop) {
    obj[prop] = obj[prop] || 0;
    if (obj[prop]++) console.log("I've seen it already");
}