---
title: strings.trimLeft() function
description: strings.trimLeft() removes specified leading characters from a string.
url: https://docs.influxdata.com/flux/v0/stdlib/strings/trimleft/
estimated_tokens: 1374
product: Flux
version: v0
---

# strings.trimLeft() function

-   Flux 0.18.0+
-   View InfluxDB support

`strings.trimLeft()` removes specified leading characters from a string.

##### Function type signature

```js
(cutset: string, v: string) => string
```

For more information, see [Function type signatures](/flux/v0/function-type-signatures/).

## Parameters

### v

(Required) String to to remove characters from.

### cutset

(Required) Leading characters to trim from the string.

## Examples

### Trim leading periods from all values in a column

```js
import "strings"

data
    |> map(fn: (r) => ({r with _value: strings.trimLeft(v: r._value, cutset: ".")}))
```

[](#view-example-input-and-output)

View example input and output

#### Input data

| _time | _value | *tag |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | …smpl_g9qczs | t1 |
| 2021-01-01T00:00:10Z | …smpl_0mgv9n | t1 |
| 2021-01-01T00:00:20Z | …smpl_phw664 | t1 |
| 2021-01-01T00:00:30Z | …smpl_guvzy4 | t1 |
| 2021-01-01T00:00:40Z | …smpl_5v3cce | t1 |
| 2021-01-01T00:00:50Z | …smpl_s9fmgy | t1 |

| _time | _value | *tag |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | …smpl_b5eida | t2 |
| 2021-01-01T00:00:10Z | …smpl_eu4oxp | t2 |
| 2021-01-01T00:00:20Z | …smpl_5g7tz4 | t2 |
| 2021-01-01T00:00:30Z | …smpl_sox1ut | t2 |
| 2021-01-01T00:00:40Z | …smpl_wfm757 | t2 |
| 2021-01-01T00:00:50Z | …smpl_dtn2bv | t2 |

#### Output data

| _time | _value | *tag |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | smpl_g9qczs | t1 |
| 2021-01-01T00:00:10Z | smpl_0mgv9n | t1 |
| 2021-01-01T00:00:20Z | smpl_phw664 | t1 |
| 2021-01-01T00:00:30Z | smpl_guvzy4 | t1 |
| 2021-01-01T00:00:40Z | smpl_5v3cce | t1 |
| 2021-01-01T00:00:50Z | smpl_s9fmgy | t1 |

| _time | _value | *tag |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | smpl_b5eida | t2 |
| 2021-01-01T00:00:10Z | smpl_eu4oxp | t2 |
| 2021-01-01T00:00:20Z | smpl_5g7tz4 | t2 |
| 2021-01-01T00:00:30Z | smpl_sox1ut | t2 |
| 2021-01-01T00:00:40Z | smpl_wfm757 | t2 |
| 2021-01-01T00:00:50Z | smpl_dtn2bv | t2 |

#### Related

-   [strings.trim() function](/flux/v0/stdlib/strings/trim/)
-   [strings.trimRight() function](/flux/v0/stdlib/strings/trimright/)
-   [strings.trimPrefix() function](/flux/v0/stdlib/strings/trimprefix/)
-   [strings.trimSuffix() function](/flux/v0/stdlib/strings/trimsuffix/)
-   [strings.trimSpace() function](/flux/v0/stdlib/strings/trimspace/)