Point 9 (Not Sharing Knowledge) and point 4 (Documenting The Code) are very similar and I've noticed in my 18 years of software development that the first people who leave a company are exactly these kind who are secretive about their code and too lazy to document their code. They may claim to have found a better job and therefore they leave the company, but they leave a mess and I would never hire them again.
The problem is also that documenting code and writing howtos is not forced by the superiors.
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
Point 9 (Not Sharing Knowledge) and point 4 (Documenting The Code) are very similar and I've noticed in my 18 years of software development that the first people who leave a company are exactly these kind who are secretive about their code and too lazy to document their code. They may claim to have found a better job and therefore they leave the company, but they leave a mess and I would never hire them again.
The problem is also that documenting code and writing howtos is not forced by the superiors.