[javascript] Resolve promises one after another (i.e. in sequence)?

First, you need to understand that a promise is executed at the time of creation.
So for example if you have a code:

["a","b","c"].map(x => returnsPromise(x))

You need to change it to:

["a","b","c"].map(x => () => returnsPromise(x))

Then we need to sequentially chain promises:

["a", "b", "c"].map(x => () => returnsPromise(x))
    .reduce(
        (before, after) => before.then(_ => after()),
        Promise.resolve()
    )

executing after(), will make sure that promise is created (and executed) only when its time comes.

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