RamdaJS groupBy and tranform object - ramda.js

Question

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" }
]
into this array of objects
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 }
]
}
]
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)

Answer 1

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)
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