parseInt("08") (no radix) returns 8 in Chrome and Firefox

This is a question for old timers

Before 2011, parseInt("08") used to return 0 as parseInt would determine 08 was an octal as it started with an 0

As @Pointy pointed out, the radix being octal for string starting with a 0 has been deprecated for a long time now

As the radix used in this case depends on the implementation, you should specify a radix (parseInt("08", 10) because there is no way to be sure whether the octal or decimal algorithm will be used

Sources:

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt#Description
• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt#Browser_compatibility