FQL v4 will be decommissioned on June 30, 2025. Ensure that you complete your migration from FQL v4 to FQL v10 by that date.

For more details, review the migration guide. Contact support@fauna.com with any questions.

ToString

This reference topic applies to FQL v4. Go to this page for the latest FQL v10 reference topics.

 
ToString( value )
to_string( value )
ToString( value )
ToStringExpr( value )
ToString( value )

Description

The ToString function converts a value to a string, if possible.

Attempting to convert a value to a string which has no string representation results in an "invalid argument" error.

Parameters

Parameter Type Definition and Requirements

value

Any

The value to attempt to convert to a String.

Returns

A String representing value.

Examples

The following query executes an array of independent ToString operations and returns the results in an array. The result array position matches the execution array position. The first operation converts a floating point literal to a string. The second operation takes an integer literal and converts it to a string. The third operation converts a date to a string.

client.query([
  q.ToString(1234.5678),
  q.ToString(true),
  q.ToString(q.Date('2020-07-06')),
  q.ToString(null),
  q.ToString(q.Time('2020-07-06T12:34:56.789Z')),
])
.then((ret) => console.log(ret))
.catch((err) => console.error(
  'Error: [%s] %s: %s',
  err.name,
  err.message,
  err.errors()[0].description,
))
[
  '1234.5678',
  'true',
  '2020-07-06',
  'null',
  '2020-07-06T12:34:56.789Z'
]
result = client.query(
  [
    q.to_string(1234.5678),
    q.to_string(True),
    q.to_string(q.date('2018-06-06')),
    q.to_string(None),
    q.to_string(q.time('2015-02-20T06:30:00Z')),
  ]
)
print(result)
['1234.5678', 'true', '2018-06-06', 'null', '2015-02-20T06:30:00Z']
result, err := client.Query(
	f.Arr{
		f.ToString(1234.5678),
		f.ToString(true),
		f.ToString(f.Date("2018-06-06")),
		f.ToString(nil),
		f.ToString(f.Null()),
		f.ToString(f.Time("2015-02-20T06:30:00Z")),
	})

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}
[1234.5678 true 2018-06-06 null null 2015-02-20T06:30:00Z]
try
{
    Value result = await client.Query(
        Arr(
            ToStringExpr(1234.5678),
            ToStringExpr(true),
            ToStringExpr(Date("2018-06-06")),
            ToStringExpr(null),
            ToStringExpr(Time("2015-02-20T06:30:00Z"))
        )
    );
    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}
Arr(StringV(1234.5678), StringV(true), StringV(2018-06-06), StringV(null), StringV(2015-02-20T06:30:00Z))
[
  ToString(1234.5678),
  ToString(true),
  ToString(Date('2020-07-06')),
  ToString(null),
  ToString(Time('2020-07-06T12:34:56.789Z'))
]
[
  '1234.5678',
  'true',
  '2020-07-06',
  'null',
  '2020-07-06T12:34:56.789Z'
]
Query metrics:

  •    bytesIn: 149

  •   bytesOut:  80

  • computeOps:   1

  •    readOps:   0

  •   writeOps:   0

  •  readBytes:   0

  • writeBytes:   0

  •  queryTime: 4ms

  •    retries:   0

Is this article helpful? 

Tell Fauna how the article can be improved:
 Visit Fauna's forums or email docs@fauna.com

Thank you for your feedback!