Well, those KZ ZS10 Pro X are still fairly cheap (40 euros), and i really like them. But there is a huge range of amazing value for money earphones out there. You just have to wade through dozens of pages of forum posts and Reddit threads to find them.

Right, you could use co-recursion. Or you could just use a queue.

FWIW you can do a better job with the JSON structure than in the article:

    {"GreaterOf": [
        {"Value": [0, "Dollar"]},
        {"Subtract": [
            {"Dependency": ["/totalTentativeTax"]},
            {"Dependency": ["/totalNonRefundableCredits"]}
        ]}
    ]}

    {"GreaterOf": [
        {"Value": {"value": 0, "kind": "Dollar"}},
        {"Subtract": {
            "minuend": {"Dependency": "/totalTentativeTax"},
            "subtrahend": {"Dependency": "/totalNonRefundableCredits"}
        }}
    ]}

You don't even need to specify a DSL to make that code declarative. It can be real code that's manipulating expression objects instead of numbers (though not in JavaScript, where there's no operator overloading), with the graph of expression objects being the result.

I think you're talking about microphonics:

https://zikman.audio/blog/cable-microphonics-what-it-is-and-...

Also sometimes called the stethoscope effect.

I think strictly speaking, this isn't actually microphonics, because that means that mechanical noise causes electrical noise, which then results in audible noise, whereas what is happening is just transmission of vibrations up the cable into the ear.

Anyway, it can be fixed with better cables. They don't have to be fancy (they don't have to be the 349 euro cables that site is selling!) - i have a pair of KZ ZS10 Pro X earphones, and using the stock cables, i don't get rustling through those.

(more generally, i have an embarrassing number of Chi-Fi earphones, and don't get rustling with any of them)