I use it too and it hasn't, you still need to look at the suggestions before you accept them. It's not that good, so I won't lose my job just yet.

Not the person to whom you asked this question, but I'm also a user of TabNine. In my experience, the "recommendations" / autocompletions provided by the tool are usually very short (probably less than 20 characters on average), and I don't use it for terribly complex chunks of code. Where I like it most is in the initialization of common code chunks like `if` and `for` loops, using variables instantiated in nearby preceding lines. It figures out things like `for(customer in customers)` as I'm writing `for`.

No, it's not auto-completing function blocks, just simple expressions that are easy to validate. E.g.,

    let lo = 0;
    let hi = vec.len();
    let mid = lo + (hi

will autocomplete to `(hi - lo) / 2` as the second autocomplete option (so I'd hit tab twice). If you were to "score" it based on top-5 it'd probably be pretty bad at guessing my intent, but then again, I get to _opt-in_ to suggestions so it just needs to be right often enough, as it doesn't bother me much to keep typing.