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I did that once.
I rewrote a complete application based only on the old code.
I didn't know what it did or how it worked, only that it did something with stocks.
A coworker who didn't know what it did or how it worked either (manually) tested the code (we had no unit tests, documentation, or anything  ).
The reason I had to rewrite it is because this application kept giving problems and no one was able to fix it (or a fix introduced new issues).
So two days work and we released the app to production (Acceptance testing? Hah! We don't need no stinkin' acceptance testing ).
And all of a sudden they got a stock of -100000
After a bit of investigating the issue it turned out that I forgot a single if statement 
The issue was resolved rather quick, they manually adjusted their stock (which they did once a month anyway) and we sent them a pie for the inconvenience.
After that we never had problems with that app again (so kudo's to me I guess) 
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Can you capture or extract inputs+results of actual production usage on the old code?
Get a month or two of transactions from the old code.
Replay it on the new code and verify that they produce identical results.
(Keep the inputs/outputs for future Unit Testing/Regression Testing of the new code)
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This is for an app which controller multiple hardware pieces. I only rewrite a controller for 1 piece.
They don't have automated test, only manual tests which takes ages apparently...
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Super Lloyd wrote: 1. my political skills are rather weak.
Presumably this is a company. Company is there to make money. Does your update, including the fix, objectively produce more money for the company?
If your refactor fails, despite your best intentions, will it cost the company money?
Super Lloyd wrote: basically told me to wait a bit and introduce the change gradually)
How are you going to introduce a complete refactor gradually?
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This is the wrong question. My refactor produce the same result so it does not add immediate value. But by this argument all refactor are useless since they should change the shape while keeping the function.
On the other hand there is a pending bug since before I come that is solved in my refactor standalone app. My standalone library is also easy to extend and can easily support automated test, which the current version does not and apparently there was also talk since before I come to do it....
At any rate the tech lead told me to sneak my new class in later.
And I will keep my test app since I can easily validate hardware behavior with it, so it add value to me at any rate.
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jschell wrote: How are you going to introduce a complete refactor gradually?
There is just 2 class that need be scrapped.
One is valuable for it static event. The other is valuable for its method that I reproduce it all.
It will be a minor change.
My code is (allegedly) big, the insertion is small.
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...I do not want to become friends with my children.
It's been over six years since I have logged in full stop, I don't know and refuse to reset my password and my kids are so glad I told them all those years ago not to try and friend me.
Michael Martin
Australia
"I controlled my laughter and simple said "No,I am very busy,so I can't write any code for you". The moment they heard this all the smiling face turned into a sad looking face and one of them farted. So I had to leave the place as soon as possible."
- Mr.Prakash One Fine Saturday. 24/04/2004
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Wait a minute...your kids are adding their parent to friend list? You must be the coolest father ever.
"It is easy to decipher extraterrestrial signals after deciphering Javascript and VB6 themselves.", ISanti[ ^]
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No they are not. Told them no 8 or so years ago.
Facebook is sending emails recommending them as friends.
Michael Martin
Australia
"I controlled my laughter and simple said "No,I am very busy,so I can't write any code for you". The moment they heard this all the smiling face turned into a sad looking face and one of them farted. So I had to leave the place as soon as possible."
- Mr.Prakash One Fine Saturday. 24/04/2004
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Ah that. Yeah, they think we like everyone.
"It is easy to decipher extraterrestrial signals after deciphering Javascript and VB6 themselves.", ISanti[ ^]
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Quote: when they're going to come back at home
Your parents ran away?
- I would love to change the world, but they won’t give me the source code.
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Michael Martin wrote: It's been over six years since I have logged in full stop
Not full stop for me... But I usually only go once a year or every 18 months to delete crap and check the settings and make them the most restrictive I can find.
But being honest... it was actually helpful a couple of years ago to reestablish contact with old buddies that had changed their email addresses / phone numbers.
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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I deleted my account. About 8 years ago, I had created an account and after 1 month I had 2 friends, both ex-girlfriends. The ironic thing was my long-term girlfriend at the time would not friend me!
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Jeremy Falcon
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I just wrote this in a piece of code I'm overhauling:
protected abstract override void ......();
An abstract class (inheriting from another abstract class) which is going to be implemented by a bunch of concrete classes which will all also be implementing two other interfaces at the same time.
What unholy mess are you getting yourself into Dave?
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There are stranger things under the coding heavens, Dave! 
Get me coffee and no one gets hurt!
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Yeah, but it feels ... wrong. A class structure that can't make up its mind how it's going to do the job.
I really can't complain. I'm the one designing the solution. Sometimes I know not why my brain comes up with this stuff. 
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know not the unknowns, that's a legal option ...
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Dave Kreskowiak wrote: Yeah, but it feels ... wrong
I somehow was expecting that ending in other way  
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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Software Zen: delete this;
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Dave Kreskowiak wrote: System.ItDidntWorkException: Something didn't work as expected.
Should that be "Something didn't work, as expected"?
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Its actually a jab at all the questions where the entire problem description is "it didn't work".
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May I suggest you...
The Weird and The Wonderful[^]
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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