[ruby-core:74346] Re: [Ruby trunk Feature#12173] `Time#till_now`

I’ll do a bit of bike shedding on this and want to address one comment by
Benoit Daloze.

What if we make it so that the method is just #until and accepts an
optional parameter?

~~~RUBY
class Time
  def until(recent = self.class.now)
    recent - self
  end
end
~~~

As Benoit suggests, if you’re doing benchmarks, you’re going to want
something more reliable—but from a user interaction perspective, I think
that this is very useful.


On Tue, Mar 15, 2016 at 4:21 AM, <[e-mail]> wrote:

> Issue #12173 has been updated by Benoit Daloze.
>
>
> Tsuyoshi Sawada wrote:
> > It is very frequent to have a time instance:
> >
> > ~~~RUBY
> > t = Time.now
> > ~~~
> >
> > and then after some operations, do:
> >
> > ~~~RUBY
> > Time.now - t
> > ~~~
>
> This seems fairly related to #8640.
> Just a note: the Time.now - t is typically not what you want if you want
> to benchmark some piece of code.
> A monotonic clock like `Process.clock_gettime(Process::CLOCK_MONOTONIC)`
> should be used instead (I know, it's a bit lengthy).
> Or well if you can require 'benchmark' then it's just Benchmark.realtime {
> ... }.
>
> ----------------------------------------
> Feature #12173: `Time#till_now`
> https://bugs.ruby-lang.org/issues/12173#change-57459
>
> * Author: Tsuyoshi Sawada
> * Status: Open
> * Priority: Normal
> * Assignee:
> ----------------------------------------
> It is very frequent to have a time instance:
>
> ~~~RUBY
> t = Time.now
> ~~~
>
> and then after some operations, do:
>
> ~~~RUBY
> Time.now - t
> ~~~
>
> I propose `Time#till_now`, which is equivalent to:
>
> ~~~RUBY
> class Time
>   def till_now; self.class.now - self end
> end
> ~~~
>
> and similar methods can perhaps be defined on `Date` and `DateTime`
> classes as well. Another candidate for the method name is `until_now`.
>
> Then we can do:
>
> ~~~RUBY
> t = Time.now
> # some heavy operation
> puts "It took #{t.till_now} secs."
>
>
>
> --
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>
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-- 
Austin Ziegler • [e-mail] • [e-mail]
http://www.halostatue.ca/ • http://twitter.com/halostatue

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