Is there a way to designate a TypeScript variable as volatile?

Currently, I am working on a project utilizing the remarkable BBC Micro Bit, and I am in the process of developing an extension for Make Code using TypeScript.

The core of my task involves handling an event triggered by a wheel encoder integrated into my robot. During this event, I perform incremental operations on certain variables. In typical Arduino language, I would designate such variables as "volatile" to signify that they could be altered by an interrupt, ensuring that I always have access to the most recent value within the variable.

control.onEvent(EventBusSource.MICROBIT_ID_IO_P0, EventBusValue.MICROBIT_PIN_EVT_RISE, function () {
    _lTicks += 1;
    _lerrTicks += 1;
    if (_lTicks % _partialTurn == 0) {
        _lTicks = 0;
        _lTurns += .0625;
    }
})

I am curious whether TypeScript has an equivalent keyword like "volatile" when declaring variables. And if it does exist, how can it be effectively implemented?

typescriptvolatilebbc-microbit

Answer №1

Unlike other programming languages, JavaScript does not have a volatile keyword because JavaScript run-times are designed to be single threaded. This unique feature ensures that the code runs without any interruptions and no other code can change its state while it is being executed.

If an event occurs while a piece of code is running, that event is placed in a queue and will only be processed once the current stack of code has finished executing.

Even technologies like WebWorkers, which allow for multiple JS threads, still adhere to the single threaded nature of JavaScript by using message passing between threads instead of allowing shared variables.

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