Bug #13992: Strange behaviour for kernel#integer method

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: 2.4.1
• Backport: 2.3: UNKNOWN, 2.4: UNKNOWN

[Ursus (Ivan Lasorsa)]

I tried this one with ruby 2.3.1 and ruby 2.4.1.

Integer('04')
4
Integer('05')
5
Integer('08')
ArgumentError: invalid value for Integer(): "08"
Integer('09')
ArgumentError: invalid value for Integer(): "09"

Does this makes sense?

[zverok (Victor Shepelev)]

Yes, it does. Leading zero designates octal number (base 8), which can't have digit "8" in it.

[zverok (Victor Shepelev)]

Just in plain Ruby, it is the same (but error message is more informative):

09
# SyntaxError: (irb):3: Invalid octal digit

[shevegen (Robert A. Heiler)]

Docu is at:

https://ruby-doc.org/core/Kernel.html#method-i-Integer

Perhaps the octal-notation could also be put into the documentation there.

And an example could be added for octal-input leading to error such as the
above. That would help explain things to newcomers who may be surprised
about the behaviour.

[Ursus (Ivan Lasorsa)]

zverok (Victor Shepelev) wrote:

Yes, it does. Leading zero designates octal number (base 8), which can't have digit "8" in it.

Integer('09', 10)
9

This works as expected. My fault thinking that 10 should be the default base

[jeremyevans0 (Jeremy Evans)]

• Status changed from Open to Closed