Discussion on: What Leads to Coding Mistakes?

Let me continue with fairly more complex, but yet not uncommon reasons!

• Overcertainty that input will have certain properties (often coupled with not having project structure in mind);
• Trying to change existing code to do similar, but another, thing;
• Writing functions with large amount of parameters of one type, then accidentally swapping them;
• Separating logically connected variables into separate objects, then expecting them to be consistent.