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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Yes, that sounds about right. Espruino doesn't actually use heap at all, and I don't believe the softdevice does either - since stack grows into heap it's basically no heap and 16k stack.
That's playing it super safe though, so at some point I may raise the amount of JSVars and reduce the available stack a little.
Because the interpreter parses as it runs, it does tend to use a little more stack - especially with recursion. Generally it's not that bad though, and there are checks in place to try and ensure that JS code execution errors before the stack is exhausted.