JavaScript: Promises and Observables [duplicate]

function doCall(a){
    return new Promise ((f) => {
        f(a * 2);
    });
}

function test () {
    let i = 10;
    doCall(i).then((a) => {
        i = a;
    });
    console.log(i);
}

I'm pretty sure the i=20, just don't want to be stupid because it seems obvious. Thanks

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