From: Marnen Laibow-Koser <marnen@...>
Date: 2009-12-31T18:59:29+09:00
Subject: Re: Why can't I use "or" here?

Albert Schlef wrote:
> Albert Schlef wrote:
>> Well. it turns out there aren't that many ways in ruby.
>> 
>> I originally tried to do the following:
>> 
>>   some_func(ARGV[0] or raise "You must provide an argument")
>> 
>> I wish it worked. But it doesn't. So I changed it to:
>> 
>>   some_func(ARGV[0] || raise "You must provide an argument")
>> 
>> It still didn't work. So finally I did:
>> 
>>   some_func(ARGV[0] || (raise "You must provide an argument"))
>> 
>> It works. But, I must say, it isn't as beautiful as my original plan. It 
>> doesn't read as English.
> 
> Hey, I now see that this works:
> 
>     some_func((ARGV[0] or raise "You must provide an argument"))
> 
> Great. On the other hand, I won't be able to remember this the next time 
> I need it.

Just use Ruby's rescue syntax instead of trying to be clever.

Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen@marnen.org

-- 
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