_methods.Self

opaque type Self[+A]

Self View Methods

Self view is another library available for all types, but it has to be activated by calling a universal ".self" method on original value.

For example:

 val pack: Pack[String] = "FOO".self.pack

Due to opaque implementation, calling self view methods incures no overhead as if they were called directly on base value.

A common use case is to manipulate an object within expression context:

 val a : Array[String] = new Array[String](1).self(_(0)="A")

because all calls are inlined, the above expression is equivalent to:

 val a : Array[String] = new Array[String](1)
 a(0)="A"

Source: Self.scala

Def

Process

Processes value with given function

Returns the base value itself

 val a : Array[String] = new Array[String](2).self(a => { a(0)="A"; a(1)="B" })

Source: Self.scala

Hash code

Returns alphanumeric hash code 4 characters long

It is shorter and display friendly compared to Java hash.

It is not meant to be used for calculations, like in Hashtable, but rather for display purposes.

Source: Self.scala

Instance id

Id is usually type name + "@" + hash code.

Source: Self.scala

Empty check

Returns true if value is empty, false - otherwise.

Any.Def.Empty is available for most known types, but can be defined for new.

Source: Self.scala

Void check

Returns true if value is null or void, false - otherwise

Note. This method includes 'null' check compared to 'isVoid' on base value.

Source: Self.scala

Convert To

Converts base value with given function

Returns the result of the conversion

Source: Self.scala

Conditionally change value

Changes base value with the given function, if condition is right

Returns new value or old value

Note:

var s = "AB"

s = s.self.mapIf(_.length == 2, _ + "C")

// gets compiled into

s = if(s.length == 2) s + "C" else s
```

Source: Self.scala

Non empty check

Returns true if value is not not empty, false - otherwise

Any.Def.Empty is available for most known types, but can be defined for new.

Source: Self.scala

Non void check

Returns true if value is not null and not void, false - otherwise

Note. This method includes 'null' check compared to 'nonVoid' on base value.

Source: Self.scala

Self pack

Creates a pack with this sigle value

Source: Self.scala

Self stream

Creates a stream with this sigle value

The following lines are inlined and produce same JVM code:

val s1 : Stream[String] = "Foo".self.stream
// same as
val s2 : Stream[String] = Stream("Foo")

Source: Self.scala

Type name

Returns type name, which is class name for reference types and given tagged name for raw types

Source: Self.scala