# Series.str.substr

> danfo.Series.str.substr(startIndex, num, options) \[[source](https://github.com/opensource9ja/danfojs/blob/master/danfojs/src/core/strings.js#L265)]

| Parameters | Type   | Description                                                    | Default                                                |
| ---------- | ------ | -------------------------------------------------------------- | ------------------------------------------------------ |
| startIndex | Number | specify the index to start obtaining the substring             | 0                                                      |
| num        | Number | The number of character to obtain starting from the startIndex | 1                                                      |
| options    | Object | **inplace**: Whether to perform the operation in-place or not. | <p>{</p><p><strong>inplace</strong>: false</p><p>}</p> |

**Returns:**

\*\*\*\* return Series

**Example**

Obtain substring( containing 4 characters) starting from the third character (2nd index).

```javascript
const dfd = require("danfojs-node")

let data = ['lower part ', ' CAPITALS city', ' this is a sentence', '  SwAp CaSe']
let sf = new dfd.Series(data)
sf.str.substr(2, 4).print()
```

{% tabs %}
{% tab title="Output" %}

```javascript
╔═══╤══════════════════════╗
║   │ 0                    ║
╟───┼──────────────────────╢
║ 0 │ wer                  ║
╟───┼──────────────────────╢
║ 1 │ APIT                 ║
╟───┼──────────────────────╢
║ 2 │ his                  ║
╟───┼──────────────────────╢
║ 3 │ SwAp                 ║
╚═══╧══════════════════════╝
```

{% endtab %}
{% endtabs %}