Should Save For User Today

shouldSaveForUserToday.js

const data = require('./data.json');

// jq '[ .transactions[].amount ]' data.json

function shouldSaveForUserToday(data) {
  const balanceThreshold = .2;
  const accountBalance = data.accounts[0].balance.available;
  const transactionAmounts = data.transactions.map(transaction => transaction.amount);
  const transactionAverage = transactionAmounts.reduce((sum, amount) => sum + amount, 0) / transactionAmounts.length;
  return transactionAverage < 0 && Math.abs(transactionAverage) < (accountBalance * balanceThreshold);
}

console.log(shouldSaveForUserToday(data) === true);