Record

com.github.tarao.record4s.Record

See theRecord companion trait

object Record

Attributes

Companion: trait
Source: Record.scala
Graph
Supertypes: class Object

trait Matchable

class Any
Self type: Record.type

Members list

Type members

Classlikes

Attributes

Source: Record.scala
Supertypes: trait Dynamic

class AnyVal

trait Matchable

class Any

Attributes

Source: Record.scala
Supertypes: trait RecordLike[R]

class Object

trait Matchable

class Any

Value members

Concrete methods

Construct a record from something else.

Type parameters

T: some type given RecordLike[T]

Value parameters

x: something that is record like

Attributes

Returns

a record

Example

 case class Person(name: String, age: Int)
 val p = Person("tarao", 3)
 val r = Record.from(p)
 // val r: com.github.tarao.record4s.%{val name: String; val age: Int} = %(name = tarao, age = 3)

Source

Record.scala

Get the field value of specified label.

It is essentially the same as record.{label} but it can access to fields hidden by own methods of class %.

Value parameters

label: a string literal field name
record: a record

Attributes

Returns

the value of the field named by label

Example

 val r = %(value = 3, toString = 10)
 r.value
 // val res0: Int = 3
 r.toString
 // val res1: String = %(value = 3, toString = 10)
 Record.lookup(r, "value")
 // val res2: Int = 3
 Record.lookup(r, "toString")
 // val res3: Int = 10

Source

Record.scala

Concrete fields

An empty record.

Attributes

Source: Record.scala

Givens

Attributes

Source: Record.scala

Attributes

Source: Record.scala

Extensions

extension [R <: %](record: R)

Alias for updated

Attributes

Source: Record.scala

Alias for concat

Attributes

Source: Record.scala

Create a new record by selecting some fields of an existing record.

Type parameters

RR: type of the new record
S: list of selected field as a Tuple

Value parameters

s: selection of fields created by select

Attributes

Returns

a new record with the selected fields

Example

 val r1 = %(name = "tarao", age = 3, email = "[email protected]")
 val r2 = r1(select.name.age)
 // val r2: com.github.tarao.record4s.%{val name: String; val age: Int} = %(name = tarao, age = 3)
 val r3 = r1(select.name(rename = "nickname").age)
 // val r3: com.github.tarao.record4s.%{val nickname: String; val age: Int} = %(nickname = tarao, age = 3)

Source

Record.scala

Create a new record by unselecting some fields of an existing record.

Type parameters

RR: type of the new record
U: list of unselected field as a Tuple

Value parameters

u: unselection of fields created by unselect

Attributes

Returns

a new record without the unselected fields

Example

 val r1 = %(name = "tarao", age = 3, email = "[email protected]")
 val r2 = r1(unselect.email)
 // val r2: com.github.tarao.record4s.%{val name: String; val age: Int} = %(name = tarao, age = 3)

Source

Record.scala

Upcast the record to specified type.

Type parameters

R2: target type

Attributes

Returns

a record containing only fields in the target type

Example

 val r1 = %(name = "tarao", age = 3, email = "[email protected]")
 // val r1: com.github.tarao.record4s.%{val name: String; val age: Int; val email: String} = %(name = tarao, age = 3, email = [email protected])
 val r2 = r1.as[% { val name: String; val age: Int }]
 // val r2: com.github.tarao.record4s.%{val name: String; val age: Int} = %(name = tarao, age = 3)

Source

Record.scala

Concatenate this record and another record.

If the both record has a field of the same name, then it takes the field from the latter record.

Type parameters

R2: a record type (given RecordLike[R2])

Value parameters

other: a record to concatenate

Attributes

Returns

a new record which has the both fields from this record and other

Example

 val r1 = %(name = "tarao", age = 3)
 val r2 = %(age = 4, email = "[email protected]")
 val r3 = r1 ++ r2
 // val r3: com.github.tarao.record4s.%{val name: String; val age: Int; val email: String} = %(name = tarao, age = 4, email = [email protected])

Source

Record.scala

Give a type tag to this record.

Type parameters

T: an arbitrary type used as a tag

Attributes

Returns

the same record with a tag type

Example

 trait Person; object Person {
   extension (p: %{val name: String} & Tag[Person]) {
     def firstName: String = p.name.split(" ").head
   }
 }
 val r = %(name = "tarao fuguta", age = 3).tag[Person]
 r.firstName
 // val res0: String = tarao

Source

Record.scala

Convert this record to a To.

Type parameters

To: a type to which the record is converted

Attributes

Returns

a new product instance

Example

 case class Person(name: String, age: Int)
 val r = %(name = "tarao", age = 3)
 r.to[Person]
 // val res0: Person = Person(tarao,3)

Source

Record.scala

Convert this record to a Tuple.

Attributes

Returns

fields of label-value pairs as a tuple

Example

 val r1 = %(name = "tarao", age = 3)
 r1.toTuple
 // val res0: (("name", String), ("age", Int)) = ((name,tarao),(age,3))

Source

Record.scala

Extend the record by fields.

If a new field has the same name as the existing field, then the new field overrides the old one.

Attributes

Returns

an object to define new fields

Example

 val r = %(name = "tarao") + (age = 3, email = "[email protected]")
 // val r: com.github.tarao.record4s.%{val name: String; val age: Int; val email: String} = %(name = tarao, age = 3, email = [email protected])

Source

Record.scala

Return values of this record as a Tuple.

Attributes

Returns

values of the record as a tuple

Example

 val r1 = %(name = "tarao", age = 3)
 r1.values
 // val res0: (String, Int) = (tarao,3)

Source

Record.scala

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