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package funk
import (
"fmt"
"reflect"
)
// ForEach iterates over elements of collection and invokes iteratee
// for each element.
func ForEach(arr interface{}, predicate interface{}) {
if !IsIteratee(arr) {
panic("First parameter must be an iteratee")
}
var (
funcValue = reflect.ValueOf(predicate)
arrValue = reflect.ValueOf(arr)
arrType = arrValue.Type()
funcType = funcValue.Type()
)
if arrType.Kind() == reflect.Slice || arrType.Kind() == reflect.Array {
if !IsFunction(predicate, 1, 0) {
panic("Second argument must be a function with one parameter")
}
arrElemType := arrValue.Type().Elem()
arrElemPointerType := reflect.New(arrElemType).Type()
usePointer := arrElemPointerType.ConvertibleTo(funcType.In(0))
// Checking whether element type is convertible to function's first argument's type.
if !arrElemType.ConvertibleTo(funcType.In(0)) && !usePointer {
panic("Map function's argument is not compatible with type of array.")
}
for i := 0; i < arrValue.Len(); i++ {
if usePointer {
funcValue.Call([]reflect.Value{arrValue.Index(i).Addr()})
} else {
funcValue.Call([]reflect.Value{arrValue.Index(i)})
}
}
}
if arrType.Kind() == reflect.Map {
if !IsFunction(predicate, 2, 0) {
panic("Second argument must be a function with two parameters")
}
// Type checking for Map<key, value> = (key, value)
keyType := arrType.Key()
valueType := arrType.Elem()
if !keyType.ConvertibleTo(funcType.In(0)) {
panic(fmt.Sprintf("function first argument is not compatible with %s", keyType.String()))
}
if !valueType.ConvertibleTo(funcType.In(1)) {
panic(fmt.Sprintf("function second argument is not compatible with %s", valueType.String()))
}
for _, key := range arrValue.MapKeys() {
funcValue.Call([]reflect.Value{key, arrValue.MapIndex(key)})
}
}
}
// ForEachRight iterates over elements of collection from the right and invokes iteratee
// for each element.
func ForEachRight(arr interface{}, predicate interface{}) {
if !IsIteratee(arr) {
panic("First parameter must be an iteratee")
}
var (
funcValue = reflect.ValueOf(predicate)
arrValue = reflect.ValueOf(arr)
arrType = arrValue.Type()
funcType = funcValue.Type()
)
if arrType.Kind() == reflect.Slice || arrType.Kind() == reflect.Array {
if !IsFunction(predicate, 1, 0) {
panic("Second argument must be a function with one parameter")
}
arrElemType := arrValue.Type().Elem()
arrElemPointerType := reflect.New(arrElemType).Type()
usePointer := arrElemPointerType.ConvertibleTo(funcType.In(0))
// Checking whether element type is convertible to function's first argument's type.
if !arrElemType.ConvertibleTo(funcType.In(0)) && !usePointer {
panic("Map function's argument is not compatible with type of array.")
}
for i := arrValue.Len() - 1; i >= 0; i-- {
if usePointer {
funcValue.Call([]reflect.Value{arrValue.Index(i).Addr()})
} else {
funcValue.Call([]reflect.Value{arrValue.Index(i)})
}
}
}
if arrType.Kind() == reflect.Map {
if !IsFunction(predicate, 2, 0) {
panic("Second argument must be a function with two parameters")
}
// Type checking for Map<key, value> = (key, value)
keyType := arrType.Key()
valueType := arrType.Elem()
if !keyType.ConvertibleTo(funcType.In(0)) {
panic(fmt.Sprintf("function first argument is not compatible with %s", keyType.String()))
}
if !valueType.ConvertibleTo(funcType.In(1)) {
panic(fmt.Sprintf("function second argument is not compatible with %s", valueType.String()))
}
keys := Reverse(arrValue.MapKeys()).([]reflect.Value)
for _, key := range keys {
funcValue.Call([]reflect.Value{key, arrValue.MapIndex(key)})
}
}
}
// Head gets the first element of array.
func Head(arr interface{}) interface{} {
value := redirectValue(reflect.ValueOf(arr))
valueType := value.Type()
kind := value.Kind()
if kind == reflect.Array || kind == reflect.Slice {
if value.Len() == 0 {
return nil
}
return value.Index(0).Interface()
}
panic(fmt.Sprintf("Type %s is not supported by Head", valueType.String()))
}
// Last gets the last element of array.
func Last(arr interface{}) interface{} {
value := redirectValue(reflect.ValueOf(arr))
valueType := value.Type()
kind := value.Kind()
if kind == reflect.Array || kind == reflect.Slice {
if value.Len() == 0 {
return nil
}
return value.Index(value.Len() - 1).Interface()
}
panic(fmt.Sprintf("Type %s is not supported by Last", valueType.String()))
}
// Initial gets all but the last element of array.
func Initial(arr interface{}) interface{} {
value := redirectValue(reflect.ValueOf(arr))
valueType := value.Type()
kind := value.Kind()
if kind == reflect.Array || kind == reflect.Slice {
length := value.Len()
if length <= 1 {
return arr
}
return value.Slice(0, length-1).Interface()
}
panic(fmt.Sprintf("Type %s is not supported by Initial", valueType.String()))
}
// Tail gets all but the first element of array.
func Tail(arr interface{}) interface{} {
value := redirectValue(reflect.ValueOf(arr))
valueType := value.Type()
kind := value.Kind()
if kind == reflect.Array || kind == reflect.Slice {
length := value.Len()
if length <= 1 {
return arr
}
return value.Slice(1, length).Interface()
}
panic(fmt.Sprintf("Type %s is not supported by Initial", valueType.String()))
}
|
