return arr.map(ele => await axis.get(ele)); is not legal - the await has no corresponding async. You may have wanted to write return arr.map(async ele =>

return arr.map(ele => await axis.get(ele)); is not legal - the await has no corresponding async. You may have wanted to write return arr.map(async ele => await axis.get(ele)); but that's the same as return arr.map(ele => axis.get(ele)); (Assuming axis.get returns a promise.) That is, it returns an array of promises of values, not a promise of an array of values like erlich's function. erlich's example is correct, with the replacement of for-in with for-of. Edit: Also, a solution using Array.map() is not impossible: return Promise.all(arr.map(ele => axis.get(ele))); but this has different characteristics than the original function. The original ran the tasks in series whereas this runs them in parallel.