IsInteger

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

IsInteger( value )
IsInteger( value )
IsInteger( value )
is_integer( value )
IsInteger( value )

Description

The IsInteger function returns true only if value is an Integer number, otherwise it returns false.

Parameters

Parameter Type Definition and Requirements

value

Any

Any value, which is to be tested to determine whether it is an Integer number or not.

Returns

Returns a Boolean, indicating whether value was an Integer number or not.

Examples

The following query uses Map to iterate over an array of all of the types of values that can be tested by a type-check function, passing each item into a Lambda function that returns an object, which contains the value and the result of calling IsInteger with that value:

try
{
    Value result = await client.Query(
        Map(
            Arr(
                Arr("array"),
                true,
                false,
                BytesV.Of(0x1, 0x2, 0x3, 0x4),
                Arr(0x1, 0x2, 0x3, 0x4),
                Collection("Letters"),
                Ref("credentials/self"),
                Database("child_db"),
                Date("2019-11-12"),
                Ref(Collection("Letters"), 123),
                10.1,
                Function("double"),
                Index("letters"),
                10,
                Ref(Keys(), "1"),
                Query(Lambda("x", Var("x"))),
                null,
                Obj("x", 10),
                Role("employees"),
                Match(Index("letters")),
                "ten",
                "10",
                Time("2020-07-06T12:34:56.789Z"),
                Ref(Tokens(), "1")
            ),
            Lambda(
                "x",
                Obj(
                    "value", Var("x"),
                    "IsInteger", IsInteger(Var("x"))
                )
            )
        )
    );

    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}
Arr(ObjectV(value: Arr(StringV(array)),IsInteger: BooleanV(False)), ObjectV(value: BooleanV(True),IsInteger: BooleanV(False)), ObjectV(value: BooleanV(False),IsInteger: BooleanV(False)), ObjectV(value: BytesV(0x01, 0x02, 0x03, 0x04),IsInteger: BooleanV(False)), ObjectV(value: Arr(LongV(1), LongV(2), LongV(3), LongV(4)),IsInteger: BooleanV(False)), ObjectV(value: RefV(id = "Letters", collection = RefV(id = "collections")),IsInteger: BooleanV(False)), ObjectV(value: RefV(id = "295432961244791296", collection = RefV(id = "credentials")),IsInteger: BooleanV(False)), ObjectV(value: RefV(id = "child_db", collection = RefV(id = "databases")),IsInteger: BooleanV(False)), ObjectV(value: FaunaDate(2019-11-12 12:00:00 AM),IsInteger: BooleanV(False)), ObjectV(value: RefV(id = "123", collection = RefV(id = "Letters", collection = RefV(id = "collections"))),IsInteger: BooleanV(False)), ObjectV(value: DoubleV(10.1),IsInteger: BooleanV(False)), ObjectV(value: RefV(id = "double", collection = RefV(id = "functions")),IsInteger: BooleanV(False)), ObjectV(value: RefV(id = "letters", collection = RefV(id = "indexes")),IsInteger: BooleanV(False)), ObjectV(value: LongV(10),IsInteger: BooleanV(True)), ObjectV(value: RefV(id = "1", collection = RefV(id = "keys")),IsInteger: BooleanV(False)), ObjectV(value: QueryV(System.Collections.Generic.Dictionary`2[System.String,FaunaDB.Query.Expr]),IsInteger: BooleanV(False)), ObjectV(value: NullV,IsInteger: BooleanV(False)), ObjectV(value: ObjectV(x: LongV(10)),IsInteger: BooleanV(False)), ObjectV(value: RefV(id = "employees", collection = RefV(id = "roles")),IsInteger: BooleanV(False)), ObjectV(value: SetRefV(System.Collections.Generic.Dictionary`2[System.String,FaunaDB.Types.Value]),IsInteger: BooleanV(False)), ObjectV(value: StringV(ten),IsInteger: BooleanV(False)), ObjectV(value: StringV(10),IsInteger: BooleanV(False)), ObjectV(value: FaunaTime(2020-07-06T12:34:56.789Z),IsInteger: BooleanV(False)), ObjectV(value: RefV(id = "1", collection = RefV(id = "tokens")),IsInteger: BooleanV(False)))
result, err := client.Query(
	f.Map(
		f.Arr{
			f.Arr{"array"},
			true,
			false,
			f.BytesV{0x01, 0x02, 0x03, 0x04},
			f.Arr{0x1, 0x2, 0x3, 0x4},
			f.Collection("Letters"),
			f.Ref("credentials/self"),
			f.Database("child_db"),
			f.Date("2019-11-12"),
			f.Ref(f.Collection("Letters"), 123),
			10.1,
			f.Function("double"),
			f.Index("letters"),
			10,
			f.Ref(f.Keys(), "1"),
			f.Query(f.Lambda("x", f.Var("x"))),
			nil,
			f.Null(),
			f.Obj{"x": 10},
			f.Role("employees"),
			f.Match(f.Index("letters")),
			"ten",
			"10",
			f.Time("2020-07-06T12:34:56.789Z"),
			f.Ref(f.Tokens(), "1"),
		},
		f.Lambda("x", f.Obj{
			"value": f.Var("x"),
			"IsInteger": f.IsInteger(f.Var("x")),
		})))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}
[map[IsInteger:false value:[array]] map[IsInteger:false value:true] map[IsInteger:false value:false] map[IsInteger:false value:[1 2 3 4]] map[IsInteger:false value:[1 2 3 4]] map[IsInteger:false value:{Letters 0xc0000b7e30 0xc0000b7e30 <nil>}] map[IsInteger:false value:{280481857410171392 0xc0000b7f50 0xc0000b7f50 <nil>}] map[IsInteger:false value:{child_db 0xc000154090 0xc000154090 <nil>}] map[IsInteger:false value:{0 63709113600 <nil>}] map[IsInteger:false value:{123 0xc00016a180 0xc00016a180 <nil>}] map[IsInteger:false value:10.1] map[IsInteger:false value:{double 0xc00016a2d0 0xc00016a2d0 <nil>}] map[IsInteger:false value:{letters 0xc00016a3f0 0xc00016a3f0 <nil>}] map[IsInteger:true value:10] map[IsInteger:false value:{1 0xc00016a540 0xc00016a540 <nil>}] map[IsInteger:false value:{[123 34 97 112 105 95 118 101 114 115 105 111 110 34 58 34 51 34 44 34 108 97 109 98 100 97 34 58 34 120 34 44 34 101 120 112 114 34 58 123 34 118 97 114 34 58 34 120 34 125 125]}] map[IsInteger:false value:{}] map[IsInteger:false value:{}] map[IsInteger:false value:map[x:10]] map[IsInteger:false value:{employees 0xc00016a750 0xc00016a750 <nil>}] map[IsInteger:false value:{map[match:{letters 0xc00016a8a0 0xc00016a8a0 <nil>}]}] map[IsInteger:false value:ten] map[IsInteger:false value:10] map[IsInteger:false value:{789000000 63729635696 <nil>}] map[IsInteger:false value:{1 0xc00016aa50 0xc00016aa50 <nil>}]]
client.query(
  q.Map(
    [
      ['array'],
      true,
      false,
      new Uint8Array([1, 2, 3, 4]),
      [0x1, 0x2, 0x3, 0x4],
      q.Collection('Letters'),
      q.Ref('credentials/self'),
      q.Database('child_db'),
      q.Date('2019-11-12'),
      q.Ref(q.Collection('Letters'), 123),
      10.1,
      q.Function('double'),
      q.Index('letters'),
      10,
      q.Ref(q.Keys(), '1'),
      q.Query(q.Lambda('x', q.Var('x'))),
      null,
      { x: 10 },
      q.Role('employees'),
      q.Match(q.Index('letters')),
      'ten',
      '10',
      q.Time('2020-07-06T12:34:56.789Z'),
      q.Ref(q.Tokens(), '1'),
    ],
    q.Lambda('x', {
      value: q.Var('x'),
      IsInteger: q.IsInteger(q.Var('x')),
    })
  )
)
.then((ret) => console.log(ret))
.catch((err) => console.error(
  'Error: [%s] %s: %s',
  err.name,
  err.message,
  err.errors()[0].description,
))
[
  { value: [ 'array' ], IsInteger: false },
  { value: true, IsInteger: false },
  { value: false, IsInteger: false },
  { value: Bytes("AQIDBA=="), IsInteger: false },
  { value: [ 1, 2, 3, 4 ], IsInteger: false },
  { value: Collection("Letters"), IsInteger: false },
  { value: Ref(Credentials(), "268432563655149056"), IsInteger: false },
  { value: Database("child_db"), IsInteger: false },
  { value: Date("2019-11-12"), IsInteger: false },
  { value: Ref(Collection("Letters"), "123"), IsInteger: false },
  { value: 10.1, IsInteger: false },
  { value: Function("double"), IsInteger: false },
  { value: Index("letters"), IsInteger: false },
  { value: 10, IsInteger: true },
  { value: Ref(Keys(), "1"), IsInteger: false },
  { value: Query(Lambda("x", Var("x"))), IsInteger: false },
  { value: null, IsInteger: false },
  { value: { x: 10 }, IsInteger: false },
  { value: Role("employees"), IsInteger: false },
  { value: Match(Index("letters")), IsInteger: false },
  { value: 'ten', IsInteger: false },
  { value: '10', IsInteger: false },
  { value: Time("2020-06-15T21:21:32.260Z"), IsInteger: false },
  { value: Ref(Tokens(), "1"), IsInteger: false }
]
result = client.query(
  q.map_(
    q.lambda_("x", {
      "value": q.var("x"),
      "IsInteger": q.is_integer(q.var("x")),
    }),
    [
      ["array"],
      True,
      False,
      bytearray([1, 2, 3, 4]),
      [0x1, 0x2, 0x3, 0x4],
      q.collection("Letters"),
      q.ref("credentials/self"),
      q.database("child_db"),
      q.date("2019-11-12"),
      q.ref(q.collection("Letters"), 123),
      10.1,
      q.function("double"),
      q.index("letters"),
      10,
      q.ref(q.keys(), "1"),
      q.query(q.lambda_("x", q.var("x"))),
      None,
      {"x": 10},
      q.role("employees"),
      q.match(q.index("letters")),
      "ten",
      "10",
      q.time("2020-07-06T12:34:56.789Z"),
      q.ref(q.tokens(), "1"),
    ],
  )
)
print(result)
[{'value': ['array'], 'IsInteger': False}, {'value': True, 'IsInteger': False}, {'value': False, 'IsInteger': False}, {'value': bytearray(b'\x01\x02\x03\x04'), 'IsInteger': False}, {'value': [1, 2, 3, 4], 'IsInteger': False}, {'value': Ref(id=Letters, collection=Ref(id=collections)), 'IsInteger': False}, {'value': Ref(id=282032258185953792, collection=Ref(id=credentials)), 'IsInteger': False}, {'value': Ref(id=child_db, collection=Ref(id=databases)), 'IsInteger': False}, {'value': datetime.date(2019, 11, 12), 'IsInteger': False}, {'value': Ref(id=123, collection=Ref(id=Letters, collection=Ref(id=collections))), 'IsInteger': False}, {'value': 10.1, 'IsInteger': False}, {'value': Ref(id=double, collection=Ref(id=functions)), 'IsInteger': False}, {'value': Ref(id=letters, collection=Ref(id=indexes)), 'IsInteger': False}, {'value': 10, 'IsInteger': True}, {'value': Ref(id=1, collection=Ref(id=keys)), 'IsInteger': False}, {'value': Query({'api_version': '4', 'lambda': 'x', 'expr': {'var': 'x'}}), 'IsInteger': False}, {'value': None, 'IsInteger': False}, {'value': {'x': 10}, 'IsInteger': False}, {'value': Ref(id=employees, collection=Ref(id=roles)), 'IsInteger': False}, {'value': SetRef({'match': Ref(id=letters, collection=Ref(id=indexes))}), 'IsInteger': False}, {'value': 'ten', 'IsInteger': False}, {'value': '10', 'IsInteger': False}, {'value': FaunaTime('2020-07-06T12:34:56.789Z'), 'IsInteger': False}, {'value': Ref(id=1, collection=Ref(id=tokens)), 'IsInteger': False}]
Map(
  [
    ['array'],
    true,
    false,
    new Uint8Array([1, 2, 3, 4]),
    [0x1, 0x2, 0x3, 0x4],
    Collection('Letters'),
    Ref('credentials/self'),
    Database('child_db'),
    Date('2019-11-12'),
    Ref(Collection('Letters'), 123),
    10.1,
    Function('double'),
    Index('letters'),
    10,
    Ref(Keys(), '1'),
    Query(Lambda('x', Var('x'))),
    null,
    { x: 10 },
    Role('employees'),
    Match(Index('letters')),
    'ten',
    '10',
    Time('2020-07-06T12:34:56.789Z'),
    Ref(Tokens(), '1'),
  ],
  Lambda('x', {
    value: Var('x'),
    IsInteger: IsInteger(Var('x')),
  })
)
[
  { value: [ 'array' ], IsInteger: false },
  { value: true, IsInteger: false },
  { value: false, IsInteger: false },
  { value: { '0': 1, '1': 2, '2': 3, '3': 4 }, IsInteger: false },
  { value: [ 1, 2, 3, 4 ], IsInteger: false },
  { value: Collection("Letters"), IsInteger: false },
  { value: Ref(Credentials(), "302043979982045696"), IsInteger: false },
  { value: Database("child_db"), IsInteger: false },
  { value: Date("2019-11-12"), IsInteger: false },
  { value: Ref(Collection("Letters"), "123"), IsInteger: false },
  { value: 10.1, IsInteger: false },
  { value: Function("double"), IsInteger: false },
  { value: Index("letters"), IsInteger: false },
  { value: 10, IsInteger: true },
  { value: Ref(Keys(), "1"), IsInteger: false },
  { value: Query(Lambda("x", Var("x"))), IsInteger: false },
  { value: null, IsInteger: false },
  { value: { x: 10 }, IsInteger: false },
  { value: Role("employees"), IsInteger: false },
  { value: Match(Index("letters")), IsInteger: false },
  { value: 'ten', IsInteger: false },
  { value: '10', IsInteger: false },
  { value: Time("2020-07-06T12:34:56.789Z"), IsInteger: false },
  { value: Ref(Tokens(), "1"), IsInteger: false }
]
Query metrics:
  •    bytesIn:   602

  •   bytesOut: 1,607

  • computeOps:     2

  •    readOps:     0

  •   writeOps:     0

  •  readBytes:   373

  • writeBytes:     0

  •  queryTime:  22ms

  •    retries:     0

This query operates on a pre-existing schema, which is not provided here.

Also, the query is executed via a client connection, that uses a secret acquired by calling the Login function (not shown here), so that Ref("credentials/self") returns a valid value.

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