Existing by coincidence, programming deliberately
Refactoring boilerplate code is always easy
in dynamically-typed languages,
but sometimes takes a bit more effort
when constrained by strong typing.
This is something I was puzzling over recently,
when the penny dropped for me
about how Rust’s macros
can be used to bridge the gap.
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Here’s three little Rust tricks
that I learned in the last week or so.
Each struck me as being an elegant approach
to working cleanly within the confines
of a strongly-typed language.
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Let’s say you have a huge amount of JSON data
and you want to parse values from it in Node.js.
Perhaps it’s stored in a file on disk
or, more trickily,
it’s on a remote machine
and you don’t want to download the entire thing
just to get some data from it.
And even if it is on the local file system,
the thing is so huge that reading it in to memory
and calling JSON.parse
will crash the process
with an out-of-memory exception.
Today I implemented a new method
for my async JSON-parsing lib, BFJ,
which has exactly this type of scenario in mind.
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“Bad performance hurts user engagement”
is a sentiment that feels intuitively true
but can be hard to sell in product conversations.
The best way to persuade a non-believer
is to point them at hard evidence
and for that you need
to do a few things
with your performance data.
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