RamdaJS groupBy 和转换对象 [英] RamdaJS groupBy and tranform object
本文介绍了RamdaJS groupBy 和转换对象的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想使用 RamdaJS 转换这个对象数组.从这个对象数组
I want to transform this array of objects using RamdaJS. From this array of objects
let children = [
{ "name": "Bob", "age": 8, "father": "Mike" },
{ "name": "David", "age": 10, "father": "Mike" },
{ "name": "Amy", "age": 2, "father": "Mike" },
{ "name": "Jeff", "age": 11, "father": "Jack" }
]
进入这个对象数组
let fatherAndKids = [
{
"father": "Mike",
"count" : 3,
"kids": [
{ "name": "Bob", "age": 8 },
{ "name": "David", "age": 10 },
{ "name": "Amy", "age": 2
}
]
},
{
"father": "Jack",
"count" : 1,
"kids": [
{ "name": "Jeff", "age": 11 }
]
}
]
这是我到目前为止所做的.但是我没有从孩子的数组中删除 father 键
Here's what i did so far. But i failed to remove the father keys from kids's array
R.pipe(
R.groupBy(R.prop('father')),
R.map(kids => ({
father: R.head(kids)["father"],
count: kids.length,
kids: kids
})),
R.values()
)(children)
推荐答案
使用 R.applySpec 创建对象,并使用 R.map 和 R.dissoc 删除 'father' 属性:
Use R.applySpec to create the object, and use R.map with R.dissoc to remove the 'father' property:
const { pipe, groupBy, prop, applySpec, head, length, map, dissoc, values } = R
const fn = pipe(
groupBy(prop('father')),
map(applySpec({
father: pipe(head, prop('father')),
count: length,
kids: map(dissoc('father'))
})),
values
)
const children = [
{ "name": "Bob", "age": 8, "father": "Mike" },
{ "name": "David", "age": 10, "father": "Mike" },
{ "name": "Amy", "age": 2, "father": "Mike" },
{ "name": "Jeff", "age": 11, "father": "Jack" }
]
const result = fn(children)
console.log(result)
<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.26.1/ramda.js"></script>
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