Why Javascript changing the value of an attribute? Not passing it to another variable [duplicate]

Question

So, I have:

const Transaction = { all: [{ description: 'Luz', amount: -50000, date: '23/01/2021', }, { description: 'Website', amount: 056, date: '23/01/2021', }, { description: 'Internet', amount: -25000, date: '23/01/2021', }, { description: 'App mobile', amount: 900000, date: '23/01/2021', }] }

Then I print it on console without doing anything before it:

const App = { init() { Transaction.all.forEach((transaction) => { console.log(transaction) }) }

The output is:

{description: "Luz", amount: -50000, date: "23/01/2021"} {description: "Website", amount: 46, date: "23/01/2021"} {description: "Internet", amount: -25000, date: "23/01/2021"} {description: "App mobile", amount: 900000, date: "23/01/2021"}

Why Website amount(declared as 056) became 46??

thanks VLAZ I had no idea of that and solved the issue declaring amount: Number('056') — romeucr
– romeucr, Commented Jan 29, 2021 at 21:17

Scott Marcus · Accepted Answer · 2021-01-29 21:08:03Z

0

Because of the leading zero, the value is interpreted as an octal and then the value is converted to decimal.

Simply remove the leading zero to avoid the confusion.

answered Jan 29, 2021 at 21:08

Scott Marcus

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1 Comment

romeucr Over a year ago

Actually I need the initial zero because of some other treatment. I have solved it by defining like that: amount: Number('056'). I had no idea it could be related to octal. :D thanks!

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