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package main | |
import ( | |
"fmt" | |
"reflect" | |
) | |
func main() { | |
a := []int{1, 2, 3, 4} | |
b := Map(a, func(val interface{}) interface{} { | |
return val.(int) * 2 | |
}) | |
fmt.Println("Map:", a, b) | |
c := Reduce(b, 0, func(val interface{}, memo interface{}) interface{} { | |
return memo.(int) + val.(int) | |
}) | |
fmt.Println("Reduce:", b, c) | |
d := Filter(b, func(val interface{}) bool { | |
return val.(int)%4 == 0 | |
}) | |
fmt.Println("Filter:", b, d) | |
} | |
func Map(in interface{}, fn func(interface{}) interface{}) interface{} { | |
val := reflect.ValueOf(in) | |
out := make([]interface{}, val.Len()) | |
for i := 0; i < val.Len(); i++ { | |
out[i] = fn(val.Index(i).Interface()) | |
} | |
return out | |
} | |
func Reduce(in interface{}, memo interface{}, fn func(interface{}, interface{}) interface{}) interface{} { | |
val := reflect.ValueOf(in) | |
for i := 0; i < val.Len(); i++ { | |
memo = fn(val.Index(i).Interface(), memo) | |
} | |
return memo | |
} | |
func Filter(in interface{}, fn func(interface{}) bool) interface{} { | |
val := reflect.ValueOf(in) | |
out := make([]interface{}, 0, val.Len()) | |
for i := 0; i < val.Len(); i++ { | |
current := val.Index(i).Interface() | |
if fn(current) { | |
out = append(out, current) | |
} | |
} | |
return out | |
} |
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