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util.go
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util.go
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package util
import (
"fmt"
"math"
"reflect"
)
// Find min and max values from given values
func FindMinMax(a ...interface{}) (interface{}, interface{}) {
var max interface{}
var min interface{}
switch a[0].(type) {
case int:
max = 0
min = math.MaxInt16
for _, value := range a {
if value.(int) < min.(int) {
min = value
}
if value.(int) > max.(int) {
max = value
}
}
case uint8:
max = uint8(0)
min = uint8(255)
for _, value := range a {
if value.(uint8) < min.(uint8) {
min = value
}
if value.(uint8) > max.(uint8) {
max = value
}
}
case uint16:
max = uint16(0)
min = uint16(math.MaxUint16)
for _, value := range a {
if value.(uint16) < min.(uint16) {
min = value
}
if value.(uint16) > max.(uint16) {
max = value
}
}
case float32:
max = float32(0.0)
min = float32(math.MaxFloat32)
for _, value := range a {
if value.(float32) < min.(float32) {
min = value
}
if value.(float32) > max.(float32) {
max = value
}
}
case float64:
max = float64(0.0)
min = float64(math.MaxFloat32)
for _, value := range a {
if value.(float64) < min.(float64) {
min = value
}
if value.(float64) > max.(float64) {
max = value
}
}
default:
panic(fmt.Sprintf("Can not find min/max for type %T", a[0]))
}
return min, max
}
// Find an object from a slice with given selector function
func Find(slice interface{}, f func(value interface{}) bool) int {
s := reflect.ValueOf(slice)
if s.Kind() == reflect.Slice {
for index := 0; index < s.Len(); index++ {
if f(s.Index(index).Interface()) {
return index
}
}
}
return -1
}
// Calculate sum for the whole slice values
func Sum(vs []interface{}) interface{} {
sum := 0.0
for _, v := range vs {
switch i := v.(type) {
case int:
sum += float64(i)
case uint:
sum += float64(i)
case uint8:
sum += float64(i)
case uint16:
sum += float64(i)
case float32:
sum += float64(i)
case float64:
sum += i
default:
fmt.Printf("Mismatch Type %T\n", v)
}
}
return sum
}
// Collect object from slice by given collection function
func Collect(vs []interface{}, f func(interface{}) interface{}) []interface{} {
vsm := make([]interface{}, len(vs))
for i, v := range vs {
vsm[i] = f(v)
}
return vsm
}