SignAlgebra

Given a sequence of as, sum them using the monoid and return the total.

Example:

scala> import cats.kernel.instances.string._

scala> Monoid[String].combineAll(List("One ", "Two ", "Three"))
res0: String = One Two Three

scala> Monoid[String].combineAll(List.empty)
res1: String = ""

Return a appended to itself n times.

Example:

scala> import cats.kernel.instances.string._

scala> Monoid[String].combineN("ha", 3)
res0: String = hahaha

scala> Monoid[String].combineN("ha", 0)
res1: String = ""

Like compare, but returns a cats.kernel.Comparison instead of an Int. Has the benefit of being able to pattern match on, but not as performant.

Returns true if x = y, false otherwise.

Returns true if x > y, false otherwise.

Returns true if x >= y, false otherwise.

Tests if a is the identity.

Example:

scala> import cats.kernel.instances.string._

scala> Monoid[String].isEmpty("")
res0: Boolean = true

scala> Monoid[String].isEmpty("something")
res1: Boolean = false

Returns true if x < y, false otherwise.

Returns true if x <= y, false otherwise.

If x > y, return x, else return y.

If x < y, return x, else return y.

Returns true if x != y, false otherwise.

Note: this default implementation provided by Order is the same as the one defined in Eq, but for purposes of binary compatibility, the override in Order has not yet been removed. See this discussion.

Like partialCompare, but returns a cats.kernel.Comparison instead of an Double. Has the benefit of being able to pattern match on, but not as performant.

Returns Some(x) if x >= y, Some(y) if x < y, otherwise None.

Returns Some(x) if x <= y, Some(y) if x > y, otherwise None.

Convert a Order[A] to a scala.math.Ordering[A] instance.

Result of comparing x with y. Returns None if operands are not comparable. If operands are comparable, returns Some[Int] where the Int sign is:

• negative iff x < y
• zero iff x = y
• positive iff x > y