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generics.go
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/
generics.go
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package helpers
import "reflect"
func Filter[T any](ss []T, filter func(T) bool) (retVal []T) {
for _, s := range ss {
if filter(s) {
retVal = append(retVal, s)
}
}
return
}
func Map[T any, S any](ss []T, f func(T) S) (retVal []S) {
for _, s := range ss {
m := f(s)
retVal = append(retVal, m)
}
return
}
func FindFirst[T any](ss []T, filter func(T) bool) (retVal T) {
for _, s := range ss {
if filter(s) {
retVal = s
break
}
}
return
}
func AnyMatch[T any](ss []T, filter func(T) bool) bool {
for _, s := range ss {
if filter(s) {
return true
}
}
return false
}
func IsUnique[T int | string](es []T) bool {
alreadyAppeared := make(map[T]bool)
for _, e := range es {
if _, value := alreadyAppeared[e]; !value {
alreadyAppeared[e] = true
} else {
return false
}
}
return true
}
func FindDuplicates[T int | string](es []T, stopAfterFirst bool) []T {
retVal := make([]T, 0)
keys := make(map[T]bool)
for _, e := range es {
if _, value := keys[e]; !value {
keys[e] = true
} else {
retVal = append(retVal, e)
if stopAfterFirst {
break
}
}
}
return retVal
}
func IsAllNilFields(x interface{}) bool {
rv := reflect.ValueOf(x)
rv = rv.Elem()
for i := 0; i < rv.NumField(); i++ {
f := rv.Field(i)
if f.IsValid() && !f.IsNil() {
return false
}
}
return true
}