# Schema

[Github](https://github.com/aykutkardas/Json-Function) repository for your stars.

## Usage

#### Install

```bash
$ npm install json-function
```

#### Import

```javascript
import { schema } from 'json-function';
```

#### Usage

Example Data

```javascript
const data = [
  {
    id: 0,
    user: {
      firstname: "John",
      lastname: "Doe"
    },
    title: "Book Name"
  },
  {
    id: 1,
    user: {
      firstname: "Johnny",
      lastname: "Doe"
    },
    title: "Book Name 2"
  }
];
```

Syntax

```javascript
schema(data, {
  book: {
    id: "id",
    title: "title"
  },
  firstname: "user.firstname",
  lastname: "user.lastname"
});
```

Output

```javascript
[
  {
    firstname: "John",
    lastname: "Doe",
    book: {
      id: 0,
      title: "Book Name"
    }
  },
  {
    firstname: "Johnny",
    lastname: "Doe",
    book: {
      id: 1,
      title: "Book Name 2"
    }
  }
];
```

Apart from this wonderful method, there are also some advanced uses.

Schema has a calback that hosts useful tools.

Example Data

```javascript
const data = [
  {
    id: 0,
    user: {
      firstname: "John",
      lastname: "Doe"
    },
    title: "Book Name"
  },
  {
    id: 1,
    user: {
      firstname: "Johnny",
      lastname: "Doe"
    },
    title: "Book Name 2"
  }
];
```

Syntax

**join()**

{% hint style="warning" %}
 The default separator is a space.
{% endhint %}

```javascript
schema(data, (sc) => ({
  id: 'id',
  fullName: sc.join('user.firstname', 'user.lastname')
}));
```

Output

```
[
  {
    id: 0,
    fullName: "John Doe"
  },
  {
    id: 1,
    fullName: "Johnny Doe"
  }
];
```

To use a custom separator.

```javascript
schema(data, (sc) => ({
  id: 'id',
  fullName: sc.join('user.firstname', 'user.lastname', { separator: '_' })
}));
```

Output

```javascript
[
  {
    id: 0,
    fullName: "John_Doe"
  },
  {
    id: 1,
    fullName: "Johnny_Doe"
  }
];
```

**custom()**

Example Data

```javascript
const data = [
  {
    id: 0,
    createdAt: "2019-03-07T19:22:36+00:00",
    user: {
      firstname: "Aykut",
      lastname: "Kardaş"
    }
  },
  {
    id: 1,
    createdAt: "2019-03-02T19:22:36+00:00",
    user: {
      firstname: "John",
      lastname: "Doe"
    }
  }
];
```

Usage

```javascript
schema(data, sc => ({
  id: "id",
  fullName: sc.custom(
    (firstname, lastname) => `${firstname.toUpperCase()} ${lastname.toUpperCase()}`,
    "user.firstname",
    "user.lastname"
  ),
  createdAt: sc.custom(
    createdAt => moment(createdAt).format("MM/DD/YYYY"),
    "createdAt"
  ),
  idIncrement: sc.custom(id => id + 1, "id")
}));
```

Output

```javascript
[
  {
    id: 0,
    fullName: "AYKUT KARDAŞ",
    createdAt: "03/07/2019",
    idIncrement: 1
  },
  {
    id: 1,
    fullName: "JOHN DOE",
    createdAt: "03/02/2019",
    idIncrement: 2
  }
]
```