merger

Documentation

Index

• type ManyMerger
  • func Cons() ManyMerger
  • func Fold(f Merger) ManyMerger
• type Merger

Types

type ManyMerger

type ManyMerger func(as, bs []interface{}) ([]interface{}, error)

ManyMerger is like merge but for values from two slices which need to be merged.

func Cons

func Cons() ManyMerger

Cons merges by appending values togeter. For example, the merger of []string{"a", "b"} and []string{"c", "d"} is the slice []string{"a", "b", "c", "d"}

func Fold

func Fold(f Merger) ManyMerger

Fold merges by using function f to merge values down to a single value. The retruned slice will either be nil or have a length of one. First value pairs from as are folded into a single value, call it a. Then value pairs from bs are folded into a single value, call it b. Then a and b are merged into a single result.

Example:

    as = [ 1 2 3 ]
    bs = [ 7 8 9 ]

     f = +

     a = f(f(1, 2), 3)
       = f(3, 3)
       = 6

     b = f(f(7, 8), 9)
       = f(15, 9)
       = 24

result = f(a, b)
       = 30

type Merger

type Merger func(a, b interface{}) (interface{}, error)

Merger for merging a and b into something new.