Example of refactoring into functions

example.js

/* this function process and object x of the pair in parameters, and add this data to the existing data of the current 0 to 30sec interval.
after the 30 sec pass, a timeout will get the bmBuffer[pair].data and send it elsewhere, there as a constant. perhaps, but bmBuffer is a global let */

let bmBuffer = {};

function bmProcessPayload(x, pair) {
  if (bmCfg.consoled.trade) {
    consoled("trade", bmAutobotPayload(x, pair));
  }
  bmBuffer[pair].data.timestamp = new Date(x.timestamp);
  bmBuffer[pair].data.date = new Date();
  bmBuffer[pair].data.lag =
    bmBuffer[pair].data.date - bmBuffer[pair].data.timestamp;
  bmBuffer[pair].data.trade = !bmBuffer[pair].data.trade
    ? 1
    : ++bmBuffer[pair].data.trade;
  bmBuffer[pair].data.open =
    bmBuffer[pair].data.open === null ? x.price : bmBuffer[pair].data.open;
  bmBuffer[pair].data.high =
    bmBuffer[pair].data.high === null
      ? x.price
      : bmBuffer[pair].data.high < x.price
      ? x.price
      : bmBuffer[pair].data.high;
  bmBuffer[pair].data.low =
    bmBuffer[pair].data.low === null
      ? x.price
      : bmBuffer[pair].data.low > x.price
      ? x.price
      : bmBuffer[pair].data.low;
  bmBuffer[pair].data.close = x.price;
  bmBuffer[pair].data.allVolume = !bmBuffer[pair].data.allVolume
    ? x.size
    : bmBuffer[pair].data.allVolume + x.size;
  bmBuffer[pair].data.allGrossValue = !bmBuffer[pair].data.allGrossValue
    ? x.grossValue
    : bmBuffer[pair].data.allGrossValue + x.grossValue;
  bmBuffer[pair].data.allHomeNotional = !bmBuffer[pair].data.allHomeNotional
    ? x.homeNotional
    : bmBuffer[pair].data.allHomeNotional + x.homeNotional;
  bmBuffer[pair].data.allForeignNotional = !bmBuffer[pair].data
    .allForeignNotional
    ? x.foreignNotional
    : bmBuffer[pair].data.allForeignNotional + x.foreignNotional;
  switch (x.side) {
    case "Sell":
      bmBuffer[pair].data.sellsVolume = !bmBuffer[pair].data.sellsVolume
        ? x.size
        : bmBuffer[pair].data.sellsVolume + x.size;
      bmBuffer[pair].data.sellsGrossValue = !bmBuffer[pair].data.sellsGrossValue
        ? x.grossValue
        : bmBuffer[pair].data.sellsGrossValue + x.grossValue;
      bmBuffer[pair].data.sellsHomeNotional = !bmBuffer[pair].data
        .sellsHomeNotional
        ? x.homeNotional
        : bmBuffer[pair].data.sellsHomeNotional + x.homeNotional;
      bmBuffer[pair].data.sellsForeignNotional = !bmBuffer[pair].data
        .sellsForeignNotional
        ? x.foreignNotional
        : bmBuffer[pair].data.sellsForeignNotional + x.foreignNotional;
      break;
    case "Buy":
      bmBuffer[pair].data.buysVolume = !bmBuffer[pair].data.buysVolume
        ? x.size
        : bmBuffer[pair].data.buysVolume + x.size;
      bmBuffer[pair].data.buysGrossValue = !bmBuffer[pair].data.buysGrossValue
        ? x.grossValue
        : bmBuffer[pair].data.buysGrossValue + x.grossValue;
      bmBuffer[pair].data.buysHomeNotional = !bmBuffer[pair].data
        .buysHomeNotional
        ? x.homeNotional
        : bmBuffer[pair].data.buysHomeNotional + x.homeNotional;
      bmBuffer[pair].data.buysForeignNotional = !bmBuffer[pair].data
        .buysForeignNotional
        ? x.foreignNotional
        : bmBuffer[pair].data.buysForeignNotional + x.foreignNotional;
      break;
    default:
  }
  bmBuffer[pair].data.sma100 = Number(smaX(pair, 100).toFixed(4));
  bmBuffer[pair].data.sma50 = Number(smaX(pair, 50).toFixed(4));
  bmBuffer[pair].data.sma30 = Number(smaX(pair, 30).toFixed(4));
  bmBuffer[pair].data.sma21 = Number(smaX(pair, 21).toFixed(4));
  bmBuffer[pair].data.sma20 = Number(smaX(pair, 20).toFixed(4));
  bmBuffer[pair].data.sma10 = Number(smaX(pair, 10).toFixed(4));

  bmBuffer[pair].data.ema21 = generateEma21(bmBuffer[pair].data);
  bmBuffer[pair].data.ema10 = generateEma10(bmBuffer[pair].data);

  bmBuffer[pair].data.macdLine = Number(
    (bmBuffer[pair].data.ema10 - bmBuffer[pair].data.ema21).toFixed(4)
  );

  sum = 0;
  i = bmHistory[pair].data.length - 8;
  y = 8 + i;
  while (i < y) {
    sum += bmHistory[pair].data[i].macdLine;
    ++i;
  }
  sum = sum / 8;
  bmBuffer[pair].data.signalLine = Number(
    (bmBuffer[pair].data.macdLine * emaK(9) + sum * (1 - emaK(9))).toFixed(4)
  );

  bmBuffer[pair].data.macdHistogram = Number(
    (bmBuffer[pair].data.macdLine - bmBuffer[pair].data.signalLine).toFixed(4)
  );
  bmBuffer[pair].status = true;
}

function generateEma21(data) {
  let sum = 0;
  let i = data.length - 20;
  let y = 20 + i;

  while (i < y) {
    if (i === 0) {
      sum += data[i].sma20;
    } else {
      sum += data[i].close;
    }
    ++i;
  }

  return Number(
    (
      bmBuffer[pair].data.close * emaK(21) +
      ((sum + data.close) / 21) * (1 - emaK(21))
    ).toFixed(4)
  );
}

function generateEma10(data) {
  let sum = 0;
  let i = data.length - 9;
  let y = 9 + i;

  while (i < y) {
    if (i === 0) {
      sum += data[i].sma10;
    } else {
      sum += data[i].close;
    }
    ++i;
  }

  return Number((data.close * emaK(10) + ((sum + data.close) / 10) * (1 - emaK(10))).toFixed(4));
}