docs-v2/content/flux/v0/stdlib/universe/tostring.md

title	description	menu	weight	flux/v0/tags	introduced
toString() function	`toString()` converts all values in the `_value` column to string types.	flux_v0_ref name parent identifier toString universe universe/toString	101	transformations type-conversions	0.7.0

toString() converts all values in the _value column to string types.

Function type signature

(<-tables: stream[{A with _value: B}]) => stream[{A with _value: B, _value: string}]

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Parameters

tables

Input data. Default is piped-forward data (<-).

Examples

Convert the _value column to strings

import "sampledata"

sampledata.float()
    |> toString()

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Input data

_time	*tag	_value
2021-01-01T00:00:00Z	t1	-2.18
2021-01-01T00:00:10Z	t1	10.92
2021-01-01T00:00:20Z	t1	7.35
2021-01-01T00:00:30Z	t1	17.53
2021-01-01T00:00:40Z	t1	15.23
2021-01-01T00:00:50Z	t1	4.43

_time	*tag	_value
2021-01-01T00:00:00Z	t2	19.85
2021-01-01T00:00:10Z	t2	4.97
2021-01-01T00:00:20Z	t2	-3.75
2021-01-01T00:00:30Z	t2	19.77
2021-01-01T00:00:40Z	t2	13.86
2021-01-01T00:00:50Z	t2	1.86

Output data

_time	_value	*tag
2021-01-01T00:00:00Z	-2.18	t1
2021-01-01T00:00:10Z	10.92	t1
2021-01-01T00:00:20Z	7.35	t1
2021-01-01T00:00:30Z	17.53	t1
2021-01-01T00:00:40Z	15.23	t1
2021-01-01T00:00:50Z	4.43	t1

_time	_value	*tag
2021-01-01T00:00:00Z	19.85	t2
2021-01-01T00:00:10Z	4.97	t2
2021-01-01T00:00:20Z	-3.75	t2
2021-01-01T00:00:30Z	19.77	t2
2021-01-01T00:00:40Z	13.86	t2
2021-01-01T00:00:50Z	1.86	t2

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