Merge pull request #10 from kuchaguangjie/eric

Added an `lambdas.Assert()` as supplement of `lambdas.Must()` for cases function only return an error

.gitignore

@@ -1,2 +1,13 @@
 __pycache__/
 .mypy_cache/
+
+# goland
+.idea
+
+# vscode
+.vscode
+
+# linux temp files,
+.swp
+*~
+

lambdas/README.md

@@ -7,22 +7,23 @@ These functions are especially helpful in combination with other `genesis` packa
 Available functions:
 
 1. EqualTo
-1. LessThan
-1. Not
-1. IsZero
-1. IsNotZero
-1. IsEmpty
-1. IsNotEmpty
-1. IsDefault
-1. IsNotDefault
-1. IsNaN
-1. IsNotNaN
-1. IsNil
-1. IsNotNil
-1. Must
-1. Safe
-1. DefaultTo
-1. Abs
-1. Min
-1. Max
-1. Default
+2. LessThan
+3. Not
+4. IsZero
+5. IsNotZero
+6. IsEmpty
+7. IsNotEmpty
+8. IsDefault
+9. IsNotDefault
+10. IsNaN
+11. IsNotNaN
+12. IsNil
+13. IsNotNil
+14. Must
+15. Ensure
+16. Safe
+17. DefaultTo
+18. Abs
+19. Min
+20. Max
+21. Default

lambdas/errors.go

@@ -8,6 +8,14 @@ func Must[T any](val T, err error) T {
 	return val
 }
 
+// Ensure wraps a function invicotaion and panic if it returned an error.
+// Compared to Must, in Ensure the called function only returns an error.
+func Ensure(err error) {
+	if err != nil {
+		panic(err)
+	}
+}
+
 // Safe wraps a function invicotaion and returns the empty value if it returned an error.
 func Safe[T any](val T, err error) T {
 	if err != nil {

lambdas/errors_test.go

@@ -15,6 +15,11 @@ func TestMust(t *testing.T) {
 	is.Equal(res, 13)
 }
 
+func TestEnsure(t *testing.T) {
+	f := func() error { return nil }
+	lambdas.Ensure(f())
+}
+
 func TestSafe(t *testing.T) {
 	is := is.New(t)
 	f1 := func() (int, error) { return 13, nil }