Optimising let in JS: http://t.co/uh2zrYgk5E It's a shame that users need to consider which compilation tiers support their fave features.
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I'm trying to decide the best voice for PL documentation.
Passive: "`let` can be used with destructuring."
Reader focused: "You can use `let` with destructuring."
Describing the PL: "FooLang supports destructuring with `let`."
Anyone have opinions or best practices?
Assertions are a surprisingly nuanced design space. In a test, if I assert `x < y`, I really want to see the values of x and y when it fails.
Do you define an API for every possible predicate (Python's assertLess, expect.js) or try to support the native syntax (c.f. pytest)?
What are the most popular languages that have used an AST walker for their implementation?
I know Ruby used to do this, but there must be others.
(I'm interested in the lowest PL speed that users will tolerate if you have awesome features.)