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package funk
import (
"reflect"
)
// Subtract returns the subtraction between two collections.
func Subtract(x interface{}, y interface{}) interface{} {
if !IsCollection(x) {
panic("First parameter must be a collection")
}
if !IsCollection(y) {
panic("Second parameter must be a collection")
}
hash := map[interface{}]struct{}{}
xValue := reflect.ValueOf(x)
xType := xValue.Type()
yValue := reflect.ValueOf(y)
yType := yValue.Type()
if NotEqual(xType, yType) {
panic("Parameters must have the same type")
}
zType := reflect.SliceOf(xType.Elem())
zSlice := reflect.MakeSlice(zType, 0, 0)
for i := 0; i < xValue.Len(); i++ {
v := xValue.Index(i).Interface()
hash[v] = struct{}{}
}
for i := 0; i < yValue.Len(); i++ {
v := yValue.Index(i).Interface()
_, ok := hash[v]
if ok {
delete(hash, v)
}
}
for i := 0; i < xValue.Len(); i++ {
v := xValue.Index(i).Interface()
_, ok := hash[v]
if ok {
zSlice = reflect.Append(zSlice, xValue.Index(i))
}
}
return zSlice.Interface()
}
// SubtractString returns the subtraction between two collections of string
func SubtractString(x []string, y []string) []string {
if len(x) == 0 {
return []string{}
}
if len(y) == 0 {
return x
}
slice := []string{}
hash := map[string]struct{}{}
for _, v := range x {
hash[v] = struct{}{}
}
for _, v := range y {
_, ok := hash[v]
if ok {
delete(hash, v)
}
}
for _, v := range x {
_, ok := hash[v]
if ok {
slice = append(slice, v)
}
}
return slice
}
|
