Docs for the spread operator: https://helpx.adobe.com/coldfusion/developing-applications/the-cfml-programming-lang[…]xpressions-and-number-signs/expressions-developing-guide.html Code:

function pow(required numeric base, required numeric exponent) {
    return base ^ exponent
}

// control - normal call
writeOutput(pow(2,3)) // 8
writeOutput("<hr>")


//using array
operandsAsArray = [2,3]
writeOutput(pow(...operandsAsArray)) // 8
writeOutput("<hr>")


// using struct
operandsAsStruct = {
    base = 2,
    exponent = 3
}
try {
    writeDump(pow(...operandsAsStruct)) // splat
} catch (any e) {
    writeDump([
        type = e.type, // Application
        message = e.message // The BASE argument passed to the pow function is not of type numeric.
    ])
}

function argTypeCheck(x, y) {
    writeDump([
        arguments = arguments,
        "x.type" = x.getClass().getName(),
        "x.key" = x.getKey(),
        "x.value" = x.getValue()
    ])
}

st = {
    x = 2,
    y = "three"
}
argTypeCheck(...st) // WTaF

https://trycf.com/gist/062dfa6d4651304929c6e144588fd8bf/acf2021?theme=monokai Result: What's going on with the struct there, @Mark Takata (Adobe)? Well: I know what's going on... the "iterable object" is just being thrown at the function instead of the elements of it as per the array example. Why would that be something that happens, instead of the struct elements being applied as named args, equiv to the array version being applied to positional ones?