1672.js

// You are given an m x n integer grid accounts where accounts[i][j] is the amount of money the i​​​​​​​​​​​th​​​​ customer has in the j​​​​​​​​​​​th​​​​ bank. 
// Return the wealth that the richest customer has.
// A customer's wealth is the amount of money they have in all their bank accounts. 
// The richest customer is the customer that has the maximum wealth.

function maximumWealth(accounts) {
  let theRichestCustomer = 0;
  for (let i = 0; i < accounts.length; i++) {
    let total = 0;
    for (let j = 0; j < accounts[i].length; j++) {
      total += accounts[i][j];
    }
    theRichestCustomer = Math.max(theRichestCustomer, total);
  }
  return console.log(theRichestCustomer);
}

maximumWealth([[1,2,3],[3,2,1]]); // 6
maximumWealth([[1,5],[7,3],[3,5]]); // 10
maximumWealth([[2,8,7],[7,1,3],[1,9,5]]); // 17