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

Fauna accounts created after August 21, 2024 must use FQL v10. These accounts will not be able to run FQL v4 queries or access the v4 Dashboard.

For more details, see the v4 EOL announcement and migration guide. Contact support@fauna.com with any questions.

Log

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

 
Log( value )
log( value )
Log( value )
Log( value )
Log( value )
Log( value )

Description

The Log function returns the natural logarithm (base 10) of the operand.

Parameters

Parameter Type Definition and Requirements

value

Number

The Number whose base-10 natural logarithm should be returned.

Returns

A Number which is the result of the Log operation.

Examples

The following query returns the base-10 natural logarithm of the value 0.5:

client.query(
  q.Log(0.5)
)
.then((ret) => console.log(ret))
.catch((err) => console.error(
  'Error: [%s] %s: %s',
  err.name,
  err.message,
  err.errors()[0].description,
))
-0.3010299956639812
result = client.query(
  q.log(0.5)
)
print(result)
-0.3010299956639812
result, err := client.Query(
	f.Log(0.5))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}
-0.3010299956639812
try
{
    Value result = await client.Query(
        Log(0.5)
    );

    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}
DoubleV(-0.3010299956639812)
System.out.println(
    client.query(
        Log(Value(0.5))
    ).get());
-0.3010299956639812
Log(0.5)
-0.3010299956639812
Query metrics:

  •    bytesIn:  11

  •   bytesOut:  32

  • computeOps:   1

  •    readOps:   0

  •   writeOps:   0

  •  readBytes:   0

  • writeBytes:   0

  •  queryTime: 1ms

  •    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!