slices exercise

data_structures/slices.go

@@ -4,22 +4,48 @@ type mapOperation func(int32) int32
 type filterOperation func(int32) bool
 
 func mapInts(op mapOperation, vals []int32) []int32 {
-	return []int32{}
+	var result []int32
+	for _,elem := range vals{
+		result = append(result,op(elem))
+	}
+	return result
 
 }
 
 func filterInts(op filterOperation, vals []int32) []int32 {
-	return []int32{3}
+	var result []int32
+	for _,elem := range vals{
+		if op(elem){
+			result = append(result,elem)
+		}
+	}
+	return result
 }
 
 func concatenate(dest []string, newValues ...string) []string {
-	return nil
+	for _,elem := range newValues{
+		dest = append(dest,elem)
+	}
+	return dest
 }
 
 func equals(list1 []string, list2 []string) bool {
-	return false
+	if len(list1)!=len(list2){
+		return false
+	}else{
+		for index,_:=range list1{
+			if list1[index]!=list2[index]{
+				return false
+			}
+		}
+		return true
+	}
 }
 
 func partialReverse(src []int, from, to int) []int {
-	return nil
+	var result []int
+	for i := to; i < from; i-- {
+		result = append(result,src[i])
+	}
+	return result
 }