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Update nest.md

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Angelos Chalaris
2018-02-26 12:23:46 +02:00
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Given a flat array of objects linked to one another, it will nest them recursively.
Useful for nesting comments, such as the ones on reddit.com.
Use recursion. Use `Array.filter()` to filter the items where the `id` matches the `link`,
then use `Array.map()` to map each one to a new object that has a `children` property which
recursively nests the items based on which ones are children of the current item. Omit the second
argument, `id`, to default to `null` which indicates the object is not linked to another one (i.e.,
it is a top level). Omit the third argument, `link`, to use `'parent_id'` as the default property
which links the object to another one by its `id`.
Use recursion.
Use `Array.filter()` to filter the items where the `id` matches the `link`, then `Array.map()` to map each one to a new object that has a `children` property which recursively nests the items based on which ones are children of the current item.
Omit the second argument, `id`, to default to `null` which indicates the object is not linked to another one (i.e. it is a top level object).
Omit the third argument, `link`, to use `'parent_id'` as the default property which links the object to another one by its `id`.
```js
const nest = (items, id = null, link = 'parent_id') =>