bench | High Precision Timing of R Expressions

Let's look at one section of the first pattern:

The main issue with the bizarro pipe is that it creates hidden side-effects and makes it easier to create subtle bugs. It decreases code maintainability.

The issue, of course, is the persistent existence of . makes it all too easy to accidentally refer to this value later down the line: its presence masks mistakes if you at some point “forget” to assign to it and think you did. It’s easy to dismiss this possibility but such errors are fairly common and, worse, very non-obvious: you won’t get an error message, you’ll just get a wrong result. By contrast, if you forget the pipe symbol somewhere, you’ll get an immediate error message.

Worse, the bizarro pipe hides this error-prone side-effect in two different ways. First, because it makes the assignment non-obvious. I’ve argued previously that -> assignment shouldn’t be used since it hides a side-effect, and side-effects should be made syntactically obvious (the side-effect here is assignment, and it should happen where it’s immediately spotted: in the first column of the expression, not hidden away at its end). This is a fundamental objection to the use of -> (or any other attempt to mask side-effects), not limited to the bizarro pipe.

And because . is by default hidden (from ls and from the inspector pane in IDEs), this makes it even easier to accidentally depend on it.

Therefore, if you want to assign to a value instead of using a pipe, just do that. But:

1. Perform right-to-left assignment, i.e. use name = value or name <- value, not value -> name.
2. Use a descriptive name.

I can’t stress enough that this is an actual source of subtle bugs — don’t underestimate it!

Another issue is that its use breaks editor support for auto-formatting code. This is a “solvable issue” in some IDEs via plugins but the solution, as it were, solves an issue that should not even exist. To clarify what I mean, if you’re using the bizarro pipe you’d presumably want a hanging indent, i.e. something along these lines:

You can do something like this:

Your tests are invalid because you're doing blocking I/O inside the timing.

However, we can use quick-bench to analyze: https://quick-bench.com/q/gt2KzKOFP4iV3ajmqANL_MhnMZk. This shows the timings are all virtually identical. What about the compiler-generated assembly code?

You need to destructure the argument to the renderItem function, as it is an object with an item field:

What you are asking for is exactly how the UVM sequence/driver mechanism works. The generator does not do any randomization until the driver is ready and asks for an item to drive.

But you can get close to what the UVM does simply by constructing your mailbox with a bound of 1. Then the put(trans) in the main loop blocks until after the driver has performed a get(). Then there will always be one transaction in the mailbox waiting for the next drive cycle.

You need to refactor your spacings and find a better combination: you have fixed height for every FlatBench but you are putting them in a fluid height container and doing negative margins. So the FlatBench height and its (very big) margin are covering each other.

If you remove the following lines you can achieve your layout with positive margins on (bottom, bottomItem, topItem)

FlatBench style fix:

I asked a senior dev at my company and he suggested that I just update my ~/.ssh.config file. I added:

Support for top level await (without passing a command line argument to enable it as an experimental feature) was introduced in Node.js 14.8.0.

The version of Node.js you are using is too old.