array of object manipulation in javascript

Question

I have an empty array inside the object like this,

const account = {
name: "David Reallycool",
expenses: []

}

and I need to create a function to add expense into an empty array, the result I need is,

const account = {
name: "David Reallycool",
expenses: [
 {
 descrition: "Rent",
 amount: 1000
 },
 {
 description: "Coffee",
 amount: 2.50
 }
]

How can I manipulate it?

• Mohammad Usman: Possible duplicate of How to add an object to an array

Answer 1

const addExpense = (expense) => {
 account.expenses.push(expense)
}
// use like this
addExpense({ description: 'Rent', amount: 1000 })
addExpense({ description: 'Coffee', amount: 2.5 })

Answer 2

const account = {
 name: "David Reallycool",
 expenses: []
}
function addExpense(description, amount){
 account.expenses.push({"description": description, "amount":amount});
}
addExpense("Test", 500);
console.log(account);

Answer 3

You need to know two things for that:

1. Changing value in array reflects the change in the original array if you are passing the array as a function parameter as it is passed by reference.
2. You need to use push() function of Array prototype to add that object in your expenses array.

function addExpense(expensesArray, expense){
 expensesArray.push(expense);
}
const account = {
 name: "David Reallycool",
 expenses: []
};
var expense = {
 descrition: "Rent",
 amount: 1000
}
addExpense(account.expenses, expense);
var expense = {
 descrition: "Coffee",
 amount: 2.5
}
addExpense(account.expenses, expense);
console.log(account);

Answer 4

As an object (account) is transferred not as a copy you can manipulate it without problems inside your function.

function addExpenses(inputAccount){
 inputAccount.expenses = [
 {
 descrition: "Rent",
 amount: 1000
 },
 {
 description: "Coffee",
 amount: 2.50
 }
 ]
}
// will be called with
addExpenses(account);
// here account will have expenses content