How to use

findLastIndex

function

in

LoDashStatic

_.forEach(files, (file) => {
    const loadedModule = this.load(path.join(dirPath, file));
    /* eslint no-magic-numbers: "off" */
    const fileName = file.slice(0, _.findLastIndex(1, '.') -2);
    modules.push(fn ? fn(loadedModule, fileName) : loadedModule);
   });

getLastPriceByAction(action) {
  if (action.toLowerCase() !== 'sell' && action.toLowerCase() !== 'buy') {
   return false;
  }
  if (this.tradeLog.length === 0) {
   return false;
  }

  const buyIndex = _.findLastIndex(this.tradeLog, { action });
  if (buyIndex === -1) {
   return false;
  }

  return (this.tradeLog[buyIndex].price);
 }

getLastAverageBuyPrice() {
  if (this.tradeLog.length === 0) {
   return false;
  }

  const buyIndex = _.findLastIndex(this.tradeLog, { action: 'buy' });
  if (buyIndex === -1) {
   return false;
  }

  const spliced = _.cloneDeep(this.tradeLog).splice(0, buyIndex + 1);
  let sellIndex = _.findLastIndex(spliced, { action: 'sell' });
  if (sellIndex === -1) {
   sellIndex = 0;
  } else {
   sellIndex += 1;
  }

  const buyTrades = spliced.splice(sellIndex, spliced.length);
  const count = buyTrades.length;
  const sum = buyTrades
   .map(trade => trade.price)
   .reduce((accumulator, currentValue) => accumulator + currentValue);
  return (sum / count);
 }