Packages

trait Identity[A] extends Associative[A]

The Identity type class describes an associative binary operator for a type A that also has an identity element. Combining any value with the identity element on either the left or the right must return the original value unchanged. For example, zero is an identity element for integer addition and the empty string is an identity element for string concatenation.

Operators with an identity element are useful because the identity element provides a sensible default value when combining values of a type and no values exist.

Linear Supertypes
Associative[A], AnyRef, Any
Known Subclasses
Inverse, CommutativeIdentity, EqualIdentity, EqualInverse
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Inherited
  1. Identity
  2. Associative
  3. AnyRef
  4. Any
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Visibility
  1. Public
  2. Protected

Abstract Value Members

  1. abstract def combine(l: => A, r: => A): A
    Definition Classes
    Associative
  2. abstract def identity: A

    The identity element.

Concrete Value Members

  1. final def intersperse(middle: A): Associative[A]
    Definition Classes
    Associative
  2. def multiplyOption(n: Int)(a: A): Option[A]
    Definition Classes
    Identity → Associative
  3. final def repeat(a: A)(n: Int): A
    Definition Classes
    Associative