65-80 for readability however once you introduce indentation this naturally increases. I always felt that shorter lines were a good way to encourage less nested code. Alas after all these years the consensus is against me.
I still like 80 columns even on modern hardware and displays. It encourages me to keep my lines tidy and to break long lines apart. Sometimes I go a little over, but it's a nice target to reach for.
Completely agree on limiting yourself reducing the nesting of code.
There is more difficulty working with code such as
if x {
//...
} else {
//...
}
Than code like
if x {
// returns from this block
}
// execution continues
In some legacy code I sometimes encounter very long chains of checks which nest 4-8 layers, which becomes very difficult to maintain a mental model of where you are in execution at any point. I try to refactor into the second pattern from above when possible.
