IsArray

Not available in this language yet.
IsArray( value )
IsArray( value )
IsArray( value )
Not available in this language yet.
IsArray( value )

Description

The IsArray function returns true only if value is an Array, otherwise it returns false.

Parameters

Argument Type Definition and Requirements

value

Any

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

Returns

Returns a boolean, indicating whether value was an array 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 IsArray with that value:

Not available in this language yet.
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.RefCollection(f.Collection("Letters"), 123),
      10.1,
      f.Function("double"),
      f.Index("all_letters"),
      10,
      f.RefCollection(f.Keys(), "248967241620521472"),
      f.Query(f.Lambda("x", f.Var("x"))),
      nil,
      f.Null(),
      f.Obj{ "x": 10 },
      f.Role("employees"),
      f.Match(f.Index("all_letters")),
      "ten",
      "10",
      f.Now(),
      f.RefCollection(f.Tokens(), "249062079147803136"),
    },
    f.Lambda("x", f.Obj{
      "value": f.Var("x"),
      "IsArray": f.IsArray(f.Var("x")),
    })))

if (err != nil) {
  fmt.Println(err)
} else {
  fmt.Println(result)
}
[map[IsArray:true value:[array]] map[IsArray:false value:true] map[IsArray:false value:false] map[IsArray:false value:[1 2 3 4]] map[IsArray:true value:[1 2 3 4]] map[IsArray:false value:{Letters 0xc0004b0510 0xc0004b0510 <nil>}] map[IsArray:false value:{264354436692836874 0xc0004b0630 0xc0004b0630 <nil>}] map[IsArray:false value:{child_db 0xc0004b0750 0xc0004b0750 <nil>}] map[IsArray:false value:{0 63709113600 <nil>}] map[IsArray:false value:{123 0xc0004b0960 0xc0004b0960 <nil>}] map[IsArray:false value:10.1] map[IsArray:false value:{double 0xc0004b0ab0 0xc0004b0ab0 <nil>}] map[IsArray:false value:{all_letters 0xc0004b0bd0 0xc0004b0bd0 <nil>}] map[IsArray:false value:10] map[IsArray:false value:{248967241620521472 0xc0004b0d20 0xc0004b0d20 <nil>}] map[IsArray:false value:{[123 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[IsArray:false value:{}] map[IsArray:false value:{}] map[IsArray:false value:map[x:10]] map[IsArray:false value:{employees 0xc0004b0f30 0xc0004b0f30 <nil>}] map[IsArray:false value:{map[match:{all_letters 0xc0004b1080 0xc0004b1080 <nil>}]}] map[IsArray:false value:ten] map[IsArray:false value:10] map[IsArray:false value:{711065000 63724301844 <nil>}] map[IsArray:false value:{249062079147803136 0xc0004b1230 0xc0004b1230 <nil>}]]
System.out.println(
    client.query(
        Map(
            Arr(
                Arr(Value("array")),
                Value(true),
                Value(false),
                Value(new byte[] {0x1, 0x2, 0x3, 0x4}),
                Arr(Value(0x1), Value(0x2), Value(0x3), Value(0x4)),
                Collection("Letters"),
                Ref("credentials/self"),
                Database("child_db"),
                Date("2019-11-12"),
                Ref(Collection("Letters"), "123"),
                Value(10.1),
                Function("double"),
                Index("all_letters"),
                Value(10),
                Ref(Keys(), "248967241620521472"),
                Query(Lambda("x", Var("x"))),
                Null(),
                Obj("x", Value(10)),
                Role("employees"),
                Match(Index("all_letters")),
                Value("ten"),
                Value("10"),
                Now(),
                Ref(Tokens(), "249062079147803136")
            ),
            Lambda(
                "x",
                Obj("value", Var("x"), "IsArray", IsArray(Var("x")))
            )
        )
    ).get());
[{value: ["array"], IsArray: true},
 {value: true, IsArray: false},
 {value: false, IsArray: false},
 {value: [0x01 0x02 0x03 0x04], IsArray: false},
 {value: [1, 2, 3, 4], IsArray: true},
 {value: ref(id = "Letters", collection = ref(id = "collections")),
  IsArray: false},
 {value: ref(id = "248967019900174848", collection = ref(id = "credentials")),
  IsArray: false},
 {value: ref(id = "child_db", collection = ref(id = "databases")),
  IsArray: false},
 {value: 2019-11-12, IsArray: false},
 {value: ref(id = "123", collection = ref(id = "Letters", collection = ref(id = "collections"))),
  IsArray: false},
 {value: 10.1, IsArray: false},
 {value: ref(id = "double", collection = ref(id = "functions")),
  IsArray: false},
 {value: ref(id = "all_letters", collection = ref(id = "indexes")),
  IsArray: false},
 {value: 10, IsArray: false},
 {value: ref(id = "248967241620521472", collection = ref(id = "keys")),
  IsArray: false},
 {value: QueryV({lambda=x, expr={var=x}}), IsArray: false},
 {value: null, IsArray: false},
 {value: {x: 10}, IsArray: false},
 {value: ref(id = "employees", collection = ref(id = "roles")),
  IsArray: false},
 {value: {@set = {match: ref(id = "all_letters", collection = ref(id =
 "indexes"))}}, IsArray: false},
 {value: "ten", IsArray: false},
 {value: "10", IsArray: false},
 {value: 2019-11-12T13:15:16.789Z, IsArray: false},
 {value: ref(id = "249062079147803136", collection = ref(id = "tokens")),
  IsArray: false}]
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('all_letters'),
      10,
      q.Ref(q.Keys(), '248967241620521472'),
      q.Query(q.Lambda('x', q.Var('x'))),
      null,
      { x: 10 },
      q.Role('employees'),
      q.Match(q.Index('all_letters')),
      'ten',
      '10',
      q.Now(),
      q.Ref(q.Tokens(), '249062079147803136'),
    ],
    q.Lambda('x', {
      value: q.Var('x'),
      IsArray: q.IsArray(q.Var('x')),
    })
  )
)
.then((ret) => console.log(ret))
[ { value: [ 'array' ], IsArray: true },
  { value: true, IsArray: false },
  { value: false, IsArray: false },
  { value: Bytes("AQIDBA=="), IsArray: false },
  { value: [ 1, 2, 3, 4 ], IsArray: true },
  { value: Collection("Letters"), IsArray: false },
  { value: Ref(Credentials(), "248967019900174848"),
    IsArray: false },
  { value: Database("child_db"), IsArray: false },
  { value: Date("2019-11-12"), IsArray: false },
  { value: Ref(Collection("Letters"), "123"), IsArray: false },
  { value: 10.1, IsArray: false },
  { value: Function("double"), IsArray: false },
  { value: Index("all_letters"), IsArray: false },
  { value: 10, IsArray: false },
  { value: Ref(Keys(), "248967241620521472"), IsArray: false },
  { value: Query(Lambda("x", Var("x"))), IsArray: false },
  { value: null, IsArray: false },
  { value: { x: 10 }, IsArray: false },
  { value: Role("employees"), IsArray: false },
  { value: Match(Index("all_letters")), IsArray: false },
  { value: 'ten', IsArray: false },
  { value: '10', IsArray: false },
  { value: Time("2019-11-12T13:15:16.789Z", IsArray: false },
  { value: Ref(Tokens(), "249062079147803136"), IsArray: false } ]
Not available in this language yet.
println(Await.result(
  client.query(
    Map(
      Arr(
        Arr("array"),
        true,
        false,
        BytesV(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("all_letters"),
        10,
        Ref(Keys(), "248967241620521472"),
        Query(Lambda("x", Var("x"))),
        Null,
        Obj("x" -> 10),
        Role("employees"),
        Match(Index("all_letters")),
        "ten",
        "10",
        Now(),
        Ref(Tokens(), "249062079147803136")
      ),
      Lambda(
        "x",
        Obj( "value" -> Var("x"), "IsArray" -> IsArray(Var("x")))
      )
    )
  ),
  5.seconds
))
[{value: ["array"], IsArray: true},
 {value: true, IsArray: false},
 {value: false, IsArray: false},
 {value: [0x01 0x02 0x03 0x04], IsArray: false},
 {value: [1, 2, 3, 4], IsArray: true},
 {value: ref(id = "Letters", collection = ref(id = "collections")),
  IsArray: false},
 {value: ref(id = "248967019900174848", collection = ref(id = "credentials")),
  IsArray: false},
 {value: ref(id = "child_db", collection = ref(id = "databases")),
  IsArray: false},
 {value: 2019-11-12, IsArray: false},
 {value: ref(id = "123", collection = ref(id = "Letters", collection = ref(id = "collections"))),
  IsArray: false},
 {value: 10.1, IsArray: false},
 {value: ref(id = "double", collection = ref(id = "functions")),
  IsArray: false},
 {value: ref(id = "all_letters", collection = ref(id = "indexes")),
  IsArray: false},
 {value: 10, IsArray: false},
 {value: ref(id = "248967241620521472", collection = ref(id = "keys")),
  IsArray: false},
 {value: {lambda: "x", expr: {var: "x"}}, IsArray: false},
 {value: NullV, IsArray: false},
 {value: {x: 10}, IsArray: false},
 {value: ref(id = "employees", collection = ref(id = "roles")), IsArray: false},
 {value: {@set = {match: ref(id = "all_letters", collection = ref(id =
 "indexes"))}}, IsArray: false},
{value: "ten", IsArray: false},
 {value: "10", IsArray: false},
 {value: 2019-11-12T13:15:16.789Z, IsArray: false},
 {value: ref(id = "249062079147803136", collection = ref(id = "tokens")),
  IsArray: false}]

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 Login (not shown here), so that Ref("credentials/self") returns a valid value.

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!