从具有提供的属性的特定值的对象数组中获取索引的函数 [英] Function to get index from an array of objects having certain value of provided property

问题描述

我的问题基于并类似于这个问题，但有一点不同，因为属性名称是可变的./p>

如何创建一个函数，该函数将为我返回具有所提供属性的特定值的对象的索引?

function indexOf(propertyName,lookingForValue,array){
 //......

 return index;
}

所以

indexOf("token",123123,[
    {id_list:1, name:'Nick',token:'312312'},{id_list:2,name:'John',token:'123123'}
    ]);

应返回1.

我遇到的主要问题是，当我将属性名称作为字符串使用时，如何检查属性值?

解决方案

function indexOf(propertyName,lookingForValue,array) {
    for (var i in array) {
        if (array[i][propertyName] == lookingForValue) {
            return i;
        }
    }
    return undefined;
}

请注意，我故意进行松散类型检查'=='，因为您为此函数提供了一个整数，而在数组中搜索的值是一个字符串.

My question is based on and similar to this one but a little bit different because property name will be variable.

How do I create a function which will return me index of object having certain value of provided property?

function indexOf(propertyName,lookingForValue,array){
 //......

 return index;
}

So,

indexOf("token",123123,[
    {id_list:1, name:'Nick',token:'312312'},{id_list:2,name:'John',token:'123123'}
    ]);

should return 1.

The main problem I have is how do I check the property value when I have the property name as string with me?

解决方案

function indexOf(propertyName,lookingForValue,array) {
    for (var i in array) {
        if (array[i][propertyName] == lookingForValue) {
            return i;
        }
    }
    return undefined;
}

Edit: Please note that I do the loose type check '==' on purpose since you are giving an integer to this function whereas in the array the value you search for is a string.

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