add ToMap funcion

README.md

@@ -2210,6 +2210,37 @@ Zip iteratively merges together the values of the slice parameters with the valu
 </p>
 </details>
 
+## func [ToMap](<https://github.com/esimov/gogu/blob/master/slice.go#L552>)
+
+```go
+func ToMap[T, K comparable](slice []T, fn func(x T) K) map[K]T
+```
+
+Converts slice to map, where keys are generated with `fn` function.
+
+<details><summary>Example</summary>
+<p>
+
+```go
+{
+	slice := []int{1, 2, 3}
+	result := ToMap(slice, func(x int) int { return x })
+}
+```
+
+#### Output
+
+```
+{1: 1, 2: 2, 3: 3}
+```
+
+</p>
+</details>
+
+
+
+
+
 ## type [Bound](<https://github.com/esimov/gogu/blob/master/find.go#L180-L182>)
 
 ```go

slice.go

@@ -547,3 +547,13 @@ func ToSlice[T any](args ...T) []T {
 
 	return slice
 }
+
+// ToMap convert slice to map
+func ToMap[T, K comparable](slice []T, fn func(x T) K) map[K]T {
+	result := make(map[K]T, len(slice))
+	for _, v := range slice {
+		k := fn(v)
+		result[k] = v
+	}
+	return result
+}

slice_test.go

@@ -688,3 +688,34 @@ func Example_unzip() {
 	// Output:
 	// [[one two] [1 2]]
 }
+
+func TestSlice_ToMap(t *testing.T) {
+	type some_struct struct {
+		Id    uint
+		Title string
+	}
+
+	s1 := some_struct{Id: 1, Title: "foo"}
+	s2 := some_struct{Id: 10, Title: "bar"}
+	s3 := some_struct{Id: 100, Title: "baz"}
+
+	input := []some_struct{
+		s1,
+		s2,
+		s3,
+	}
+
+	result := ToMap(input, func(x some_struct) uint { return x.Id })
+
+	assert := assert.New(t)
+	assert.True(len(result) == 3)
+	assert.Equal(map[uint]some_struct{s1.Id: s1, s2.Id: s2, s3.Id: s3}, result)
+}
+
+func Example_toMap() {
+	slice := []int{1, 2, 3}
+	result := ToMap(slice, func(x int) int { return x })
+
+	fmt.Println(result)
+	// {1: 1, 2: 2, 3: 3}
+}