lodash uniq-选择要保留在对象数组中的重复对象 [英] lodash uniq - choose which duplicate object to keep in array of objects

问题描述

有任何方法可以基于非空键来指定要保留的数组项.似乎uniq只会保留第一次出现.

is there any way to specify which array item to keep based on a key being non-empty. it seems uniq just keeps the first occurrence.

例如:

var fruits = [
{'fruit': 'apples', 'location': '', 'quality': 'bad'}, 
{'fruit': 'apples', 'location': 'kitchen', 'quality': 'good'}, 
{'fruit': 'pears', 'location': 'kitchen', 'quality': 'excellent'}, 
{'fruit': 'oranges', 'location': 'kitchen', 'quality': ''}
];


console.log(_.uniq(fruits, 'fruit'));


/* output is:

Object { fruit="apples",  quality="bad",  location=""}
Object { fruit="pears",  location="kitchen",  quality="excellent"}
Object { fruit="oranges",  location="kitchen",  quality=""}

*/

有什么办法告诉lodash uniq选择具有位置值的重复项吗?它保留的是坏苹果而不是好苹果.

Is there any way to tell lodash uniq to choose the duplicate that has a location value ? It's keeping the bad apples instead of the good apples.

~~~

我的最终解决方案是在uniq中使用sortByOrder

My final solution was using sortByOrder inside uniq

console.log(_.uniq(_.sortByOrder(fruits, ['fruit','location'], ['asc','desc']),'fruit'))

导致:

Object { fruit="apples",  location="kitchen",  quality="good"}
Object { fruit="oranges",  location="kitchen",  quality=""}
Object { fruit="pears",  location="kitchen",  quality="excellent"}

推荐答案

从我在 https://lodash.com/docs#uniq 无法指定.您可能想要做的是一组水果，然后您可以选择所需的质量.这取决于上下文以及您为什么需要它.

From what I see in docs at https://lodash.com/docs#uniq there is no way to specify that. Probably what you want to do is a groupBy fruit and then you can choose what quality you need. It depends on context and why you need it.

您能再解释一下您的问题吗?

Can you explain your problem a little more?

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