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.

Not

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

 
Not(value)
not_(value)
Not(value)
Not(value)
Not(value)
Not(value)

Description

The Not function computes the negation of a boolean value, returning true if its argument is "false", or false if its argument is "true".

Parameters

Parameter Type Definition and Requirements

value

Boolean

A single Boolean value.

Returns

A Boolean value.

Examples

The following query returns false because an argument of "true" is provided:

client.query(
  q.Not(true)
)
.then((ret) => console.log(ret))
.catch((err) => console.error(
  'Error: [%s] %s: %s',
  err.name,
  err.message,
  err.errors()[0].description,
))
false
result = client.query(
  q.not_(True)
)
print(result)
False
result, err := client.Query(
	f.Not(true))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}
false
try
{
    Value result = await client.Query(
        Not(true)
    );
    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}
BooleanV(False)
System.out.println(
    client.query(
        Not(Value(true))
    ).get());
false
Not(true)
false
Query metrics:

  •    bytesIn:  12

  •   bytesOut:  18

  • computeOps:   1

  •    readOps:   0

  •   writeOps:   0

  •  readBytes:   0

  • writeBytes:   0

  •  queryTime: 2ms

  •    retries:   0

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