update func comment (#981)

errors.go

@@ -69,7 +69,7 @@ func (msg *Error) MarshalJSON() ([]byte, error) {
 	return json.Marshal(msg.JSON())
 }
 
-// Implements the error interface
+// Error implements the error interface
 func (msg Error) Error() string {
 	return msg.Err.Error()
 }
@@ -78,7 +78,7 @@ func (msg *Error) IsType(flags ErrorType) bool {
 	return (msg.Type & flags) > 0
 }
 
-// Returns a readonly copy filtered the byte.
+// ByType returns a readonly copy filtered the byte.
 // ie ByType(gin.ErrorTypePublic) returns a slice of errors with type=ErrorTypePublic
 func (a errorMsgs) ByType(typ ErrorType) errorMsgs {
 	if len(a) == 0 {
@@ -96,17 +96,16 @@ func (a errorMsgs) ByType(typ ErrorType) errorMsgs {
 	return result
 }
 
-// Returns the last error in the slice. It returns nil if the array is empty.
+// Last returns the last error in the slice. It returns nil if the array is empty.
 // Shortcut for errors[len(errors)-1]
 func (a errorMsgs) Last() *Error {
-	length := len(a)
-	if length > 0 {
+	if length := len(a); length > 0 {
 		return a[length-1]
 	}
 	return nil
 }
 
-// Returns an array will all the error messages.
+// Errors returns an array will all the error messages.
 // Example:
 // 		c.Error(errors.New("first"))
 // 		c.Error(errors.New("second"))