Add helpers for finding sum and product

Author: aaronbee

day02/day02.go

@@ -6,6 +6,8 @@ import (
 	"os"
 	"strconv"
 	"strings"
+
+	"github.com/aaronbee/aoc2023"
 )
 
 func main() {
@@ -97,9 +99,5 @@ func (cntr counter) union(o counter) {
 }
 
 func (cntr counter) power() int {
-	p := 1
-	for _, c := range cntr {
-		p *= c
-	}
-	return p
+	return aoc2023.ProdMapVal(cntr)
 }

day03/day03.go

@@ -5,6 +5,8 @@ import (
 	"os"
 	"strconv"
 	"strings"
+
+	"github.com/aaronbee/aoc2023"
 )
 
 func main() {
@@ -37,11 +39,8 @@ func part1(data []string) int {
 			i = x + 1
 		}
 	}
-	sum := 0
-	for _, part := range parts {
-		sum += part
-	}
-	return sum
+
+	return aoc2023.SumMapVal(parts)
 }
 
 func addPartsNear(data []string, parts map[loc]int, x, y int) {
@@ -113,9 +112,5 @@ func gearRatio(data []string, x, y int) int {
 	if len(parts) != 2 {
 		return 0
 	}
-	ratio := 1
-	for _, part := range parts {
-		ratio *= part
-	}
-	return ratio
+	return aoc2023.ProdMapVal(parts)
 }

day04/day04.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"os"
 	"strings"
+
+	"github.com/aaronbee/aoc2023"
 )
 
 func main() {
@@ -26,10 +28,7 @@ func main() {
 			counts[n+i+1] += count
 		}
 	}
-	var part2 int
-	for _, v := range counts {
-		part2 += v
-	}
+	part2 := aoc2023.SumSlice(counts)
 	fmt.Println("Part 1:", part1)
 	fmt.Println("Part 2:", part2)
 }

utils.go

@@ -0,0 +1,27 @@
+package aoc2023
+
+type addable interface {
+	~int8 | ~uint8 | ~int16 | ~uint16 | ~int32 | ~uint32 | ~int64 | ~uint64 | ~int | ~uint
+}
+
+func SumSlice[S ~[]V, V addable](s S) (sum V) {
+	for _, v := range s {
+		sum += v
+	}
+	return sum
+}
+
+func SumMapVal[M ~map[K]V, K comparable, V addable](m M) (sum V) {
+	for _, v := range m {
+		sum += v
+	}
+	return sum
+}
+
+func ProdMapVal[M ~map[K]V, K comparable, V addable](m M) (prod V) {
+	prod = 1
+	for _, v := range m {
+		prod *= v
+	}
+	return prod
+}