我如何检查对象的数组有重复的属性值？ [英] How can I check if the array of objects have duplicate property values?

问题描述

我需要一些帮助通过遍历数组，我一直陷入或重新发明轮子。

I need some help with iterating through array, I keep getting stuck or reinventing the wheel.

values = [
    { name: 'someName1' },
    { name: 'someName2' },
    { name: 'someName1' },
    { name: 'someName1' }
]

我怎么能检查是否有两个（或更多）同名数组值？我不需要一个计数器，只设置了一些变量，如果数组的值不是唯一的。有记住，数组的长度是动态的，也是数组值。

How could I check if there are two (or more) same name value in array? I do not need a counter, just setting some variable if array values are not unique. Have in mind that array length is dynamic, also array values.

推荐答案

使用<一个href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map\">array.prototype.map和<一个href=\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some\">array.prototype.some:

var values = [
    { name: 'someName1' },
    { name: 'someName2' },
    { name: 'someName4' },
    { name: 'someName2' }
];

var valueArr = values.map(function(item){ return item.name });
var isDuplicate = valueArr.some(function(item, idx){ 
    return valueArr.indexOf(item) != idx 
});
console.log(isDuplicate);

的jsfiddle。

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