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package slices
import (
"golang.org/x/exp/slices"
)
// Filter reduces slice values using given function.
// It operates with a copy of given slice
func Filter[S ~[]T, T any](s S, fn func(T) bool) S {
if len(s) == 0 {
return s
}
return Reduce(slices.Clone(s), fn)
}
// Reduce is like Filter, but modifies original slice.
func Reduce[S ~[]T, T any](s S, fn func(T) bool) S {
if len(s) == 0 {
return s
}
var p int
for _, v := range s {
if fn(v) {
s[p] = v
p++
}
}
return s[:p]
}
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