How to add object into an array javascript

Question

I'm trying to add an object to the expense array using the addExpense method.

const account = {
 expenses: [],
 addExpense: function(description, amount){
 let addObject = {
 description : amount
 }
 this.expenses.push(addObject)
 }
}
account.addExpense('Shopping', 50)
console.log(account.expenses)

I get no errors but the result gives me an object using the parameter name and not the actual string value, 'Shopping'. The amount argument works fine.

[{"description": 50}]

Answer 1

Use computed property names - an expression in brackets that evaluates to the key name (the description value in this case):

let addObject = {
 [description] : amount
}

Demo:

const account = {
 expenses: [],
 addExpense: function(description, amount){
 let addObject = {
 [description] : amount
 }
 this.expenses.push(addObject)
 }
}
account.addExpense('Shopping', 50)
console.log(account.expenses)

Answer 2

Right now, you are setting the "description" property statically. You want a computed property name, like so:

let addObject = {
 [description] : amount
}

Full Example:

const account = {
 expenses: [],
 addExpense: function(description, amount){
 let addObject = {
 [description] : amount
 }
 this.expenses.push(addObject)
 }
}
account.addExpense('Shopping', 50)
console.log(account.expenses)

Answer 3

let account = {
 expenses: [],
 addExpense: function(description, amount){
 let addObject = {};
 addObject[description] = amount
 this.expenses.push(addObject)
 }
}
account.addExpense('Shopping', 50)
console.log(account.expenses)

• mhodges: const =/= immutability. const merely says that the variable may not be reassigned, it has nothing to do with the value (in regards to object types).