Semigroup

public protocol Semigroup

A semigroup is an algebraic structure that consists of a set of values and an associative operation.


                    
                    
                    
                      combine(_:)

An associative operation to combine values of the implementing type.

This operation must satisfy the semigroup laws:

a.combine(b).combine(c) == a.combine(b.combine(c))

Swift

func combine(_ other: Self) -> Self


                                  other

Value to combine with the receiver.

Combination of the receiver value with the parameter value.


                    
                    
                    
                      combine(_:_:)

Extension method

Combines two values of the implementing type.

Swift

static func combine(_ a: Self, _ b: Self) -> Self

`a`	Value of the implementing type.
`b`	Value of the implementing type.

Combination of a and b.


                    
                    
                    
                      combineAll(_:_:)

Extension method

Combines a variable number of values (at least one) of the implementing type, in the order provided in the call.

Swift

static func combineAll(_ first: Self, _ elems: Self...) -> Self

`first`	First value of the implementing type.
`elems`	Values of the implementing type.

A single value of the implementing type representing the combination of all the parameter values.


                    
                    
                    
                      combineAll(_:_:)

Extension method

Combines an array of values of the implementing type, in the order provided in the call.

Swift

static func combineAll(_ first: Self, _ elems: [Self]) -> Self

`first`	First value of the implementing type.
`elems`	Values of the implementing type.

A single value of the implementing type representing the combination of all the parameter values.