@unction/treeify

![Tests][BADGE_TRAVIS]
![Stability][BADGE_STABILITY]
![Dependencies][BADGE_DEPENDENCY]

> Array> => Array => TreeType

This takes a list of functions (the folders) and an array of objects or an
object of objects (the collection) to create a tree. Each function in
the list of folders will in some way return a new object. All of the objects
produced are then turned into a final tree.

`` javascript
const collection = [
{
id: "a1",
type: "resources",
attributes: {
version: "v1",
namespace: "accounts",
}
},
{
id: "a2",
type: "resources",
attributes: {
version: "v1",
namespace: "accounts",
}
},
{
id: "b1",
type: "resources",
attributes: {
version: "v1",
namespace: "profiles",
}
},
{
id: "b1",
type: "resources",
attributes: {
version: "v2",
namespace: "profiles",
}
}
]
``

The order goes from outer layer to deeper layer, so in this case the outer
level properties will be based on key("type"), and the deepest layer
properties will be based on key("id").

` javascript
const functions =

treeify(
[
groupBy(key("type")),
groupBy(keyChain(["attributes", "namespace"])),
groupBy(keyChain(["attributes", "version"])),
indexBy(key("id")),
]
)(
collection
)
`

The resulting object looks like this:

` javascript
{
resources: {
accounts: {
v1: {
a1: {
id: "a1",
type: "resources",
attributes: {
version: "v1",
namespace: "accounts",
}
},
a2: {
id: "a2",
type: "resources",
attributes: {
version: "v1",
namespace: "accounts",
}
}
}
},
profiles: {
v1: {
b1: {
id: "b1",
type: "resources",
attributes: {
version: "v1",
namespace: "profiles",
}
}
},
v2: {
b1: {
id: "b1",
type: "resources",
attributes: {
version: "v2",
namespace: "profiles",
}
}
}
}
}
}
``

[BADGE_TRAVIS]: https://img.shields.io/travis/unctionjs/treeify.svg?maxAge=2592000&style=flat-square
[BADGE_STABILITY]: https://img.shields.io/badge/stability-strong-green.svg?maxAge=2592000&style=flat-square
[BADGE_DEPENDENCY]: https://img.shields.io/david/unctionjs/treeify.svg?maxAge=2592000&style=flat-square