array.push example.js

example.js

//create empty array of bank accounts
let bankAccounts = []


// function to create a new account
const addAccount = function( name, amount ) {
  // create new account object
  let newAccount = {
    accountName: name,
    balance: amount
  };

  // push returns new length of the array after push operation
  // push new object into accounts array, storing the number of accounts
  const numAccounts = bankAccounts.push( newAccount );
  
  // since arrays are 0 indexed, length is always 1 more than the last index 
  // (eg, last item in array is array.length - 1, subtract one from numAccounts
  // to get the index of the account in the array
  const accountNumber = numAccounts - 1;
  
  return accountNumber;
};


// function to deposit into account
const deposit = function ( accountNo, amount ) {
  // access the bank account deposit and add the new amount
  newBalance = bankAccounts[ accountNo ].balance + amount;
  
  // store it back into the account balance
  bankAccounts[ accountNo ].balance =  newBalance;
};


// create a new account and keep the account number
const newAccountNo = addAccount( 'testAccount', 100 );  // newAccountNo == 0 (first item in array)

// deposit more into the new account
deposit( newAccountNo, 100 );