根据另一个数组按顺序对数组进行排序 [英] Sort array by order according to another array
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问题描述
我有一个从数据库中返回的对象,如下所示:[{id:1},{id:2},{id:3}]
.我还有另一个数组,它指定了第一个数组的排序顺序,例如:[2,3,1]
.
I have an object that is being returned from a database like this: [{id:1},{id:2},{id:3}]
. I have another array which specified the order the first array should be sorted in, like this: [2,3,1]
.
我正在寻找可以接受这两个数组并返回[{id:2},{id:3},{id:1}]
的方法或算法.理想情况下,它应该是高效的,而不是n平方.
I'm looking for a method or algorithm that can take in these two arrays and return [{id:2},{id:3},{id:1}]
. Ideally it should be sort of efficient and not n squared.
推荐答案
如果要使用线性时间,请首先从第一个数组构建一个哈希表,然后通过循环第二个数组按顺序选择项:
If you want linear time, first build a hashtable from the first array and then pick items in order by looping the second one:
data = [{id:5},{id:2},{id:9}]
order = [9,5,2]
hash = {}
data.forEach(function(x) { hash[x.id] = x })
sorted = order.map(function(x) { return hash[x] })
document.write(JSON.stringify(sorted))
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