Rewriting

Why

• Too hard to work with current

  • To make changes

• Too long to fix bugs or add features

• Severe issues which cannot be fixed

• Influential people wnating to use new technology

Patterns

• Strangler

Costs

• Something that works, is battle tested, a new app is not and issues/bugs will occur

• The cost of creating it

  • Always some issue that affects the new project which did not affect the old

  • other users cannot change

• The cost of testing current functionality

• The cost of maintaining two code bases

  • Always catch up

• The current app will have logic which may not be documeneted (test/docs) which may be forgotten in new app

• Takes more time than you think

Links

• https://www.quora.com/Why-are-people-afraid-of-rewriting-software

• https://www.joelonsoftware.com/2000/04/06/things-you-should-never-do-part-i/