In JavaScript, numbers cannot begin with a zero

var number = 05000;
var addNumber = 1;

When I try to add number + addNumber, the result seems to be incorrect.

 var total = number + addNumber; // the result is 20481

Refer to the image below for the quick watch result:

https://i.sstatic.net/Hwz84.png

However, if I use the value 5000 (without 0 at the beginning), the calculation turns out to be correct. Why is that?

Answer №1

Adding a 0 before a number transforms it into an octal number literal, which is then interpreted in base 8.

It's important to note that placing leading zeros before numbers can lead to unexpected outcomes. As discussed in this Stack Overflow post, it may not achieve the desired result.

If you were to execute your code in strict mode, an error message would have been generated:

Uncaught SyntaxError: Octal literals are not allowed in strict mode.

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