## Extracts

Read from various data sources.

## Transforms

Shape and optimize for your needs.

## Loads

Store and secure in one of many available data sinks.

```
<?php
declare(strict_types=1);
use function Flow\ETL\DSL\{data_frame, from_sequence_number, lit, ref, to_stream, when};
require __DIR__ . '/../../../autoload.php';
data_frame()
->read(from_sequence_number('number', 1, 100))
->collect()
->withEntry(
'type',
when(
ref('number')->isOdd(),
then: lit('odd'),
else: lit('even')
)
)
->write(to_stream(__DIR__ . '/output.txt', truncate: false))
->run();
```

## Output

```
+--------+------+
| number | type |
+--------+------+
| 1 | odd |
| 2 | even |
| 3 | odd |
| 4 | even |
| 5 | odd |
| 6 | even |
| 7 | odd |
| 8 | even |
| 9 | odd |
| 10 | even |
| 11 | odd |
| 12 | even |
| 13 | odd |
| 14 | even |
| 15 | odd |
| 16 | even |
| 17 | odd |
| 18 | even |
| 19 | odd |
| 20 | even |
| 21 | odd |
| 22 | even |
| 23 | odd |
| 24 | even |
| 25 | odd |
| 26 | even |
| 27 | odd |
| 28 | even |
| 29 | odd |
| 30 | even |
| 31 | odd |
| 32 | even |
| 33 | odd |
| 34 | even |
| 35 | odd |
| 36 | even |
| 37 | odd |
| 38 | even |
| 39 | odd |
| 40 | even |
| 41 | odd |
| 42 | even |
| 43 | odd |
| 44 | even |
| 45 | odd |
| 46 | even |
| 47 | odd |
| 48 | even |
| 49 | odd |
| 50 | even |
| 51 | odd |
| 52 | even |
| 53 | odd |
| 54 | even |
| 55 | odd |
| 56 | even |
| 57 | odd |
| 58 | even |
| 59 | odd |
| 60 | even |
| 61 | odd |
| 62 | even |
| 63 | odd |
| 64 | even |
| 65 | odd |
| 66 | even |
| 67 | odd |
| 68 | even |
| 69 | odd |
| 70 | even |
| 71 | odd |
| 72 | even |
| 73 | odd |
| 74 | even |
| 75 | odd |
| 76 | even |
| 77 | odd |
| 78 | even |
| 79 | odd |
| 80 | even |
| 81 | odd |
| 82 | even |
| 83 | odd |
| 84 | even |
| 85 | odd |
| 86 | even |
| 87 | odd |
| 88 | even |
| 89 | odd |
| 90 | even |
| 91 | odd |
| 92 | even |
| 93 | odd |
| 94 | even |
| 95 | odd |
| 96 | even |
| 97 | odd |
| 98 | even |
| 99 | odd |
| 100 | even |
+--------+------+
100 rows
```