values assigned to node.js variable return strange values

Question

I am getting hands-on Node.js, and I found it pretty exciting. However, when I was trying to work out with variables I got strange results. When 01234 is assigned to a variable, 668 is displayed as response and when 0123 is assigned, 83 is returned as the response. I failed to understand logic. I am attaching this screengrab.

I checked same in c# and I got expected result. What is happening here in node.js?

James Maa · Accepted Answer · 2017-09-22 17:13:14Z

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In javascript, starting with 0 is indicating this number is in octal

012 = 2 + 1 * 8 = 10

Referenced here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt#Octal_interpretations_with_no_radix

answered Sep 22, 2017 at 17:13

James Maa

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oreofeolurin · Accepted Answer · 2017-09-22 17:19:18Z

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An octal numeral consists of an ASCII digit 0 followed by one or more of the ASCII digits 0 through 7 interspersed with underscores, and can represent a positive, zero, or negative integer.

So 012 is an An octal numeral so that's why it is equal to 10 in the decimal.

A good solution is to parse it.

parseInt("012");

edited Sep 22, 2017 at 17:19

answered Sep 22, 2017 at 17:13

oreofeolurin

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