From: Siep Korteling <s.korteling@...>
Date: 2010-04-29T16:16:45+09:00
Subject: Re: Use of STDOUT.flush after puts

Dave Baldwin wrote:
> On 28 Apr 2010, at 16:44, Alex DeCaria wrote:
> 
>> I've seen several examples on this forum where folks have used
>> STDOUT.flush after printing a query to a terminal.  For example:
>> 
>> puts "Delete indicated item [yes, no]"
>> STDOUT.flush
>> response = gets.chomp
>> 
>> What is the purpose of the 'STDOUT.flush', and is it always necessary to
>> use it?  What are the possible problems if it isn't used?
> 
> It forces the output to appear immediately, otherwise it may be held in 
> a buffer for some indeterminate time, usually until enough output has 
> accumulated to make it worth while to commit to the terminal, however as 
> you are waiting for input this threshold will never be reached.
> 
> Dave.

Instead of STDOUT.flush-ing multiple times, you can set STDOUT.sync = 
true once.
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