Compose Promises and Synchronous Functions

compose.coffee

# use lodash/underscore, this could probably actually be a mixin for those
compose = (fns) ->
    _.reduceRight fns, (composed, currentFn) ->
        _.compose (valueOrPromise) ->
            vop = valueOrPromise
            if Boolean vop and vop.then
                vop.then (value) ->
                    currentFn value
            else
                currentFn vop
        , composed

###
non-working version that would have no dependencies
compose = (fns) ->
    fns.reverse().reduce (composed, currentFn) ->
        (valueOrPromise) ->
            vop = valueOrPromise
            if Boolean vop and vop.then
                vop.then (value) ->
                    currentFn composed value
            else
                currentFn composed vop
###