Create or alter SQL Server object

SQL Server doesn’t really support ‘create or alter’, at least not until 2019 where support starts to appear.
This is an elegant way of updating stored objects without dropping them.
This technique retains any granted permissions.
From Stackoverflow thread

—- Stored Procedure
IF OBJECT_ID('[dbo].[<Name_Of_Routine, , >]') IS NULL
EXEC('CREATE PROCEDURE [dbo].[<Name_Of_Routine, , >] AS SET NOCOUNT ON;')
EXEC('GRANT EXECUTE ON [<Name_Of_Routine, , >] TO Public AS dbo;')
GO
ALTER PROCEDURE ...

—- Scalar Function
IF OBJECT_ID('[dbo].[<Name_Of_Routine, , >]') IS NULL
EXEC('CREATE FUNCTION [dbo].[<Name_Of_Routine, , >] (@i INT) RETURNS INT AS BEGIN RETURN 0 END;')
EXEC('GRANT EXECUTE ON [<Name_Of_Routine, , >] TO Public AS dbo;')
GO
ALTER FUNCTION ...

—- Table-based Function
IF OBJECT_ID('[dbo].[<Name_Of_Routine, , >]') IS NULL
EXEC('CREATE FUNCTION [dbo].[<Name_Of_Routine, , >] (@i INT) RETURNS @O TABLE(i INT) AS BEGIN INSERT INTO @O SELECT 0 RETURN END;')
GO

-- Triggers
IF OBJECT_ID('[dbo].[<Name_Of_Trigger, , >]') IS NULL -- Check if Trigger Exists
EXEC('CREATE TRIGGER [dbo].[<Name_Of_Trigger, , >] ON [<Name_Of_Table, , >] AFTER UPDATE AS SET NOCOUNT ON;') -- Create dummy/empty SP
GO

-- Views
IF OBJECT_ID('[dbo].[<Name_Of_View, , >]') IS NULL -- Check if View Exists
EXEC('CREATE VIEW [dbo].[<Name_Of_View, , >] AS SELECT 1;') -- Create dummy/empty View
GO
ALTER VIEW ...