combination-async.js

const makeRequest = async () => {
 try {
    const res = await requestMock();
    return res.data.arr.map(test => test + 2);
  } catch (err) {
    console.log(err)
  }
} 

const multipleRequest = async () => {
  await makreRequest() // It is not obligatory to declare the value. We can use the same function.
  const [req1, res1, req3] = await Promise.all([makeRequest, makeRequest, makeRequest])
  console.log([…req1, …req2, …req3 ])
}