github.com/moby/docker@v26.1.3+incompatible/internal/sliceutil/sliceutil.go (about)

     1  // FIXME(thaJeztah): remove once we are a module; the go:build directive prevents go from downgrading language version to go1.16:
     2  //go:build go1.19
     3  
     4  package sliceutil
     5  
     6  func Dedup[T comparable](slice []T) []T {
     7  	keys := make(map[T]struct{})
     8  	out := make([]T, 0, len(slice))
     9  	for _, s := range slice {
    10  		if _, ok := keys[s]; !ok {
    11  			out = append(out, s)
    12  			keys[s] = struct{}{}
    13  		}
    14  	}
    15  	return out
    16  }
    17  
    18  func Map[S ~[]In, In, Out any](s S, fn func(In) Out) []Out {
    19  	res := make([]Out, len(s))
    20  	for i, v := range s {
    21  		res[i] = fn(v)
    22  	}
    23  	return res
    24  }
    25  
    26  func Mapper[In, Out any](fn func(In) Out) func([]In) []Out {
    27  	return func(s []In) []Out {
    28  		res := make([]Out, len(s))
    29  		for i, v := range s {
    30  			res[i] = fn(v)
    31  		}
    32  		return res
    33  	}
    34  }