Promise.all but sequentally!

Promise.sequental

var list = [
      "someJsonUrl",
      "someJsonUrl",
      "someJsonUrl"
    ].map((url) => fetch.bind(null, url));
    
function sequentialPromise(promiseFuncList) {
      return new Promise((resolve, reject) => {
        const resultsList = [];
        promiseFuncList.reduce((accPromise, nextPromiseFunc, i, arr) => {
          return accPromise.then((res) => {
            if (res && res.json)
              res.json().then((e) => {
                resultsList.push(e);
                if (i === arr.length - 1) {
                  resolve(resultsList);
                }
              });
            if (i < arr.length - 1) return arr[i + 1]();
          });
        }, promiseFuncList[0]());
      });
}

sequentialPromise(list).then((res) => console.log(res));