请与属性值'X'的对象是否在JavaScript中数组存在 [英] Check whether an object with property value 'x' exists in an array in Javascript

问题描述

我有很多，我试图从过滤掉重复的对象。当一个对象有一个属性， IMAGEURL 这是present在另一个对象，我想忽略这个对象，继续前进。

I have a lot of objects that I'm trying to filter out duplicates from. When an object has a property, IMAGEURL which is present in another object, I want to ignore this object and move on.

我用的NodeJS 此所以如果有我可以用它来使库更容易让我知道。

I'm using nodeJS for this so if there's a library I can use to make it easier let me know.

我在阵列检查字符串值，做这样的事情以前做过类似的实现：

I've done similar implementations before with checking string values in arrays, doing something like:

var arr = ['foo', 'bar'];
if(arr.indexOf('foo') == -1){
   arr.push('foo')
}

但是，这不会为对象的工作，尽我可以告诉。什么是我选择这里？把它更简单：

But this won't work for objects, as best I can tell. What are my options here? To put it more simply:

var obj1 = {IMAGEURL: 'http://whatever.com/1'};
var obj2 = {IMAGEURL: 'http://whatever.com/2'};
var obj3 = {IMAGEURL: 'http://whatever.com/1'};

var arr = [obj1, obj2, obj3];
var uniqueArr = [];

for (var i = 0; i<arr.length; i++){
    // For all the iterations of 'uniqueArr', if uniqueArr[interation].IMAGEURL == arr[i].IMAGEURL, don't add arr[i] to uniqueArr
}

我怎样才能做到这一点？

How can I do this?

推荐答案

您可以只使用一个内部循环（跟踪我们是否已经使用看到变量 - 实际上，你可以在这里使用的标签，但我发现变量方法更易于阅读）：

You can just use an inner loop (keeping track of whether we've seen the loop by using a seen variable -- you can actually use labels here, but I find the variable method to be easier to read):

for (var i = 0; i<arr.length; i++){
    var seen = false;
    for(var j = 0; j != uniqueArr.length; ++j) {
        if(uniqueArr[j].IMAGEURL == arr[i].IMAGEURL) seen = true;
    }
    if(!seen) uniqueArr.push(arr[i]);
}

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