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.
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- abstract def combine(l: => A, r: => A): A
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- abstract def identity: A
The identity element.
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- final def intersperse(middle: A): Associative[A]
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