feat: find

find.go

@@ -0,0 +1,12 @@
+package underscore
+
+import "errors"
+
+func Find[T any](values []T, predicate func(T) bool) (res T, err error) {
+	for _, v := range values {
+		if predicate(v) {
+			return v, nil
+		}
+	}
+	return res, errors.New("value not found")
+}

find_test.go

@@ -0,0 +1,26 @@
+package underscore_test
+
+import (
+	"testing"
+
+	u "github.com/rjNemo/underscore"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestFind(t *testing.T) {
+	want := 5
+	nums := []int{2, 4, 5, 6, 8, 0}
+	isOdd := func(n int) bool { return n%2 != 0 }
+
+	got, err := u.Find(nums, isOdd)
+	assert.Equal(t, want, got)
+	assert.NoError(t, err)
+}
+
+func TestNotFound(t *testing.T) {
+	nums := []int{2, 4, 6, 8, 0}
+	isOdd := func(n int) bool { return n%2 != 0 }
+
+	_, err := u.Find(nums, isOdd)
+	assert.Error(t, err)
+}

some_test.go

@@ -13,5 +13,4 @@ func TestSome(t *testing.T) {
 	isEven := func(n int) bool { return n%2 == 0 }
 
 	assert.True(t, u.Some(nums, isEven))
-
 }