Dev (#29)

README.md

@@ -113,6 +113,28 @@ added := myMap.AddOK("key1", 1)
 fmt.Println(added) // true
 ```
 
+### AddValueFunc
+Adds a key-value pair to the map using a function to determine the key from the given value.
+
+```Go
+myMap := &gomap.Map[string, int]{}
+myMap.AddValueFunc(5, func(value int) string {
+	return strconv.Itoa(value)
+})
+fmt.Println(myMap) // &map[5:5]
+```
+
+### AddValuesFunc
+Adds multiple key-value pairs to the map using a function to determine keys from the given values.
+
+```Go
+myMap := &gomap.Map[string, int]{}
+myMap.AddValuesFunc([]int{5, 10, 15}, func(i int, value int) string {
+	return strconv.Itoa(value) + strconv.Itoa(i)
+})
+fmt.Println(myMap) // &map[50:5 101:10 152:15]
+```
+
 ### Contains
 Checks if the given value is present in the hash table and returns the corresponding key along with a boolean indicating existence.
 

gomap.go

@@ -98,6 +98,42 @@ func (gomap *Map[K, V]) AddManyOK(values ...map[K]V) *slice.Slice[bool] {
 	return &successfulInsertions
 }
 
+// AddValueFunc adds a key-value pair to the map using a function to determine the key from the given value.
+// It takes a value and a key calculation function as input. The function calculates the key based on the provided value
+// and adds the key-value pair to the map.
+//
+//	// Create a new Map instance.
+//	newMap := make(gomap.Map[string, int])
+//
+//	// Function to calculate key from value (for example, using string conversion)
+//	gomap.AddValueFunc(5, func(value int) string {
+//		return strconv.Itoa(value)
+//	})  // Adds key "5" with value 5 to the map
+func (gomap *Map[K, V]) AddValueFunc(value V, fn func(value V) K) *Map[K, V] {
+	return gomap.Add(fn(value), value)
+}
+
+// AddValuesFunc adds multiple key-value pairs to the map using a function to determine keys from the given values.
+// It takes a slice of values and a key calculation function as input. The function calculates the key for each value
+// based on its index and the provided value, and adds the corresponding key-value pairs to the map.
+//
+//	// Create a new Map instance.
+//	newMap := make(gomap.Map[string, int])
+//
+//	values := []int{5, 10, 15}
+//	// Function to calculate key from value and index (for example, using string conversion and appending index)
+//	gomap.AddValuesFunc(values, func(i int, value int) string {
+//		return strconv.Itoa(value) + strconv.Itoa(i)
+//	})  // Adds key "50", "101" and "152" with values 5, 10, and 15 to the map
+func (gomap *Map[K, V]) AddValuesFunc(values []V, fn func(i int, value V) K) *Map[K, V] {
+	for i, value := range values {
+		gomap.AddValueFunc(value, func(value V) K {
+			return fn(i, value)
+		})
+	}
+	return gomap
+}
+
 // AddOK inserts a new key-value pair into the map only if the key does not already exist in the map.
 // If the key already exists, the insertion fails, and false is returned. If the key is new, a new key-value pair is added to the gomap,
 // and true is returned to indicate a successful insertion.

gomap_test.go

@@ -4,6 +4,7 @@ import (
 	"math"
 	"reflect"
 	"sort"
+	"strconv"
 	"strings"
 	"testing"
 
@@ -271,6 +272,57 @@ func TestAddOK(t *testing.T) {
 	}
 }
 
+// TestAddValueFunc tests Map.AddValueFunc.
+func TestAddValueFunc(t *testing.T) {
+	// Create a new Map instance.
+	newMap := &gomap.Map[string, int]{} // Change the data types accordingly.
+
+	// Function to calculate key from value using string conversion.
+	keyCalculationFunc := func(value int) string {
+		return strconv.Itoa(value)
+	}
+
+	// Test case: Add a key-value pair using AddValueFunc.
+	valueToAdd := 5
+	newMap.AddValueFunc(valueToAdd, keyCalculationFunc)
+
+	// Verify that the key-value pair is added correctly.
+	expectedKey := "5"
+	expectedValue := 5
+	retrievedValue, ok := newMap.Get(expectedKey)
+
+	if !ok || retrievedValue != expectedValue {
+		t.Errorf("Expected key '%s' with value %d, but got key '%s' with value %d", expectedKey, expectedValue, expectedKey, retrievedValue)
+	}
+}
+
+// TestAddValuesFunc tests the AddValuesFunc method of the Map.
+func TestAddValuesFunc(t *testing.T) {
+	// Test case 1: Adding multiple key-value pairs to the map using a slice of values and a key calculation function.
+	newMap := &gomap.Map[string, int]{} // Create an empty map.
+	values := []int{5, 10, 15}
+	keyCalculationFunc := func(i int, value int) string {
+		return strconv.Itoa(value) + strconv.Itoa(i)
+	}
+	newMap.AddValuesFunc(values, keyCalculationFunc) // Adds keys "50", "101", and "152" with values 5, 10, and 15 to the map.
+
+	// Verify that the key-value pairs have been added correctly.
+	expectedKeyValues := map[string]int{
+		"50":  5,
+		"101": 10,
+		"152": 15,
+	}
+
+	for key, expectedValue := range expectedKeyValues {
+		actualValue, ok := newMap.Get(key)
+		if !ok {
+			t.Errorf("Expected key '%s' to be in the map, but it was not found.", key)
+		} else if actualValue != expectedValue {
+			t.Errorf("Expected value %d for key '%s', but got %d", expectedValue, key, actualValue)
+		}
+	}
+}
+
 // TestContains tests Map.Contains.
 func TestContains(t *testing.T) {
 	// Test case 1: Check for a value in an empty gomap.