Run an array of promises one by one

queue.js

function queue(all) {
  return new Promise((resolve, reject) => {
    const output = [];

    next(all.splice(0, 1))
  
    function next(go) {
      go();
      .then(res => {
        output.push(res);

        if ( !next ) {
          return resolve(output)
        }

        next(all.splice(0,1));
      })
    }
  })
}

const output = queue([
  () => { return Promise.resolve(1) },
  () => { return Promise.resolve(2) },
  () => { return Promise.resolve(3) },
])

console.log(output) // [1,2,3]