Ajax Ladi

ajax-ladi.js

const generatePromise = (valueGeneratorFn, delay = 1) => {
  return new Promise((resolve) => {
    setTimeout(() => resolve(valueGeneratorFn()), delay);
  });
};

const getFirstDataSetAsync = async (input) => {
  return generatePromise(() => input * 1);
};

const getSecondDataSetAsync = async (input) => {
  return generatePromise(() => input * 2);
};

const getThirdDataSetAsync = async (input, repeatBy) => {
  return generatePromise(() =>
    Array(repeatBy).fill(input.toString()).join("~")
  );
};

const generatePromisesForColumns = async (columns, repeatBy) => {
  const colsPromises = columns.map((col) =>
    getThirdDataSetAsync(col, repeatBy)
  );
  const result = await Promise.all(colsPromises);
  return result;
};

const loadData = async (columns) => {
  const sourceList = [1, 2, 3, 4, 5, 6];
  const promises = sourceList
    .map(async (input) => await getFirstDataSetAsync(input))
    .map(async (valuePromise) => {
      const value = await valuePromise;
      const result = await getSecondDataSetAsync(value);
      return result;
    })
    .map(async (valuePromise) => {
      const value = await valuePromise;
      return generatePromisesForColumns(columns, value);
    });
  return await Promise.all(promises).then((a) => {
    const toReturn = a.reduce((acc, curr) => {
      return acc.concat(curr);
    }, []);
    return toReturn;
  });
};

module.exports = {
  loadData,
};

index.js

const { loadData } = require("./ajax-ladi.js");
const run = async () => {
  const result = await loadData([1, 2, 3, 4, 5]);
  // result.forEach(console.log);
  console.log(result);
  console.log("Hola!");
};

(async () => {
  await run();
})();