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array.go
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array.go
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package linq
import "strings"
func Unique[TSource any](source []TSource, equals func(t1 TSource, t2 TSource) bool) []TSource {
newArr := make([]TSource, 0)
for i := 0; i < len(source); i++ {
repeat := false
for j := i + 1; j < len(source); j++ {
if equals(source[i], source[j]) {
repeat = true
break
}
}
if !repeat {
newArr = append(newArr, source[i])
}
}
return newArr
}
func Map[TSource any, TResult any](source []TSource, selector func(*TSource) TResult) []TResult {
if source == nil {
return nil
}
if selector == nil {
panic("parameter selector is nil")
}
result := make([]TResult, len(source))
for i := 0; i < len(source); i++ {
v := &source[i]
result[i] = selector(v)
}
return result
}
func Sum[TSource any](source []TSource, selector func(*TSource) int) int {
if source == nil {
panic("parameter source is nil")
}
if selector == nil {
panic("parameter selector is nil")
}
count := 0
for i := 0; i < len(source); i++ {
count += selector(&source[i])
}
return count
}
func IndexOf[TSource any](source []TSource, predicate func(*TSource) bool) int {
if source == nil {
panic("parameter source is nil")
}
if predicate == nil {
panic("parameter selector is nil")
}
for i := 0; i < len(source); i++ {
v := &source[i]
if predicate(v) {
return i
}
}
return -1
}
func Contains[TSource comparable](source []TSource, item *TSource) bool {
if source == nil {
return false
}
for i := 0; i < len(source); i++ {
if source[i] == *item {
return true
}
}
return false
}
func MapMany[TSource any, TResult any](source []TSource, selector func(*TSource) []TResult) []TResult {
if source == nil {
panic("parameter source is nil")
}
if selector == nil {
panic("parameter selector is nil")
}
result := make([]TResult, 0)
for i := 0; i < len(source); i++ {
v := &source[i]
result = append(result, selector(v)...)
}
return result
}
func First[TSource any](source []TSource, predicate func(*TSource) bool) *TSource {
if source == nil {
panic("parameter source is nil")
}
if predicate == nil {
panic("parameter predicate is nil")
}
for i := 0; i < len(source); i++ {
v := &source[i]
if predicate(v) {
return v
}
}
return nil
}
func Filter[TSource any](source []TSource, predicate func(*TSource) bool) []TSource {
if source == nil {
return nil
}
if predicate == nil {
panic("parameter predicate is nil")
}
result := make([]TSource, 0)
for i := 0; i < len(source); i++ {
v := &source[i]
if predicate(v) {
result = append(result, *v)
}
}
return result
}
func FilterCount[TSource any](source []TSource, predicate func(*TSource) bool) int {
if source == nil {
return 0
}
if predicate == nil {
panic("parameter predicate is nil")
}
count := 0
for i := 0; i < len(source); i++ {
v := &source[i]
if predicate(v) {
count += 1
}
}
return count
}
func FilterMap[TSource any, TResult any](source []TSource, selector func(*TSource) (TResult, bool)) []TResult {
if source == nil {
panic("parameter source is nil")
}
if selector == nil {
panic("parameter selector is nil")
}
result := make([]TResult, 0)
for i := 0; i < len(source); i++ {
v := &source[i]
if r, ok := selector(v); ok {
result = append(result, r)
}
}
return result
}
func ToMap[TSource any, TKey comparable](source []TSource, keySelector func(*TSource) TKey) map[TKey]*TSource {
if source == nil {
panic("parameter source is nil")
}
if keySelector == nil {
panic("parameter keySelector is nil")
}
result := make(map[TKey]*TSource)
for i := 0; i < len(source); i++ {
v := &source[i]
result[keySelector(v)] = v
}
return result
}
func ToMapPtr[TSource any, TKey comparable](source []*TSource, keySelector func(*TSource) TKey) map[TKey]*TSource {
if source == nil {
panic("parameter source is nil")
}
if keySelector == nil {
panic("parameter keySelector is nil")
}
result := make(map[TKey]*TSource)
for i := 0; i < len(source); i++ {
v := source[i]
result[keySelector(v)] = v
}
return result
}
func Values[TSource any, TKey comparable](source map[TKey]TSource) []TSource {
if source == nil {
panic("parameter source is nil")
}
result := make([]TSource, 0, len(source))
for _, v := range source {
result = append(result, v)
}
return result
}
func Keys[TSource any, TKey comparable](source map[TKey]TSource) []TKey {
if source == nil {
panic("parameter source is nil")
}
result := make([]TKey, 0, len(source))
for k := range source {
result = append(result, k)
}
return result
}
func Distinct[TSource any, TKey comparable](source []TSource, keySelector func(*TSource) TKey) []TKey {
if source == nil {
panic("parameter source is nil")
}
if keySelector == nil {
panic("parameter keySelector is nil")
}
result := make([]TKey, 0)
dict := make(map[TKey]struct{})
for i := 0; i < len(source); i++ {
k := keySelector(&source[i])
if _, ok := dict[k]; !ok {
result = append(result, k)
dict[k] = struct{}{}
}
}
return result
}
func DistinctBy[TSource any, TKey comparable](source []TSource, keySelector func(*TSource) TKey) []*TSource {
if source == nil {
panic("parameter source is nil")
}
if keySelector == nil {
panic("parameter keySelector is nil")
}
result := make([]*TSource, 0)
dict := make(map[TKey]struct{})
for i := 0; i < len(source); i++ {
k := keySelector(&source[i])
if _, ok := dict[k]; !ok {
result = append(result, &source[i])
dict[k] = struct{}{}
}
}
return result
}
func ToSet(source []string) map[string]struct{} {
result := make(map[string]struct{})
for i := range source {
result[strings.ToLower(source[i])] = struct{}{}
}
return result
}
func ToSetByKey[TSource any, TKey comparable](source []TSource, keySelector func(*TSource) TKey) map[TKey]struct{} {
result := make(map[TKey]struct{})
for i := range source {
result[keySelector(&source[i])] = struct{}{}
}
return result
}
func GroupBy[TSource any, TKey comparable](source []TSource, keySelector func(*TSource) TKey) map[TKey][]*TSource {
if source == nil {
panic("parameter source is nil")
}
if keySelector == nil {
panic("parameter keySelector is nil")
}
result := make(map[TKey][]*TSource)
for i := range source {
k := keySelector(&source[i])
result[k] = append(result[k], &source[i])
}
return result
}
func Intersect[TSource comparable](source []TSource, other []TSource) []TSource {
if source == nil {
panic("parameter source is nil")
}
if other == nil {
panic("parameter other is nil")
}
dict := make(map[TSource]struct{})
result := make([]TSource, 0)
for i := range source {
dict[source[i]] = struct{}{}
}
for i := range other {
if _, ok := dict[other[i]]; ok {
result = append(result, other[i])
}
}
return result
}
func Combine[T comparable](source []T, other []T) []T {
if source == nil {
panic("parameter source is nil")
}
if other == nil {
panic("parameter other is nil")
}
dict := make(map[T]struct{})
result := make([]T, 0)
for i := range source {
dict[source[i]] = struct{}{}
}
for i := range other {
if _, ok := dict[other[i]]; !ok {
result = append(result, other[i])
}
}
return result
}