| Bug with string methods? [message #89846] |
Wed, 10 December 2014 14:31  |
penteado
Messages: 866
Registered: February 2018
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Senior Member
Administrator |
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Am I misunderstanding the documentation, or is there a bug with some string methods?
When a string has more than one character, substring() works as I expected, from the documentation:
IDL> str='ab'
IDL> print,str.substring(-1)
b
But if the string has length 1, I get an empty string:
IDL> str='a'
IDL> print,str.substring(-1)
IDL> print,strlen(str.substring(-1))
0
IDL>
A similar problem happens with remove():
IDL> str='ab'
IDL> print,str.remove(-1)
a
IDL> str='a'
IDL> print,str.remove(-1)
a
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| Re: Bug with string methods? [message #89850 is a reply to message #89846] |
Wed, 10 December 2014 16:02  |
chris_torrence@NOSPAM
Messages: 528
Registered: March 2007
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Senior Member |
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On Wednesday, December 10, 2014 3:31:21 PM UTC-7, Paulo Penteado wrote:
> Am I misunderstanding the documentation, or is there a bug with some string methods?
>
> When a string has more than one character, substring() works as I expected, from the documentation:
>
> IDL> str='ab'
> IDL> print,str.substring(-1)
> b
>
> But if the string has length 1, I get an empty string:
>
> IDL> str='a'
> IDL> print,str.substring(-1)
>
> IDL> print,strlen(str.substring(-1))
> 0
> IDL>
>
> A similar problem happens with remove():
>
> IDL> str='ab'
> IDL> print,str.remove(-1)
> a
> IDL> str='a'
> IDL> print,str.remove(-1)
> a
Drats, that looks like a bug. Good catch Paulo. I'll try to slip it into the next patch release.
-Chris
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