From: nobu@...
Date: 2014-08-14T07:23:20+00:00
Subject: [ruby-core:64355] [ruby-trunk - Feature #10131] [Feedback] Greatest multiple of r not greater than x

Issue #10131 has been updated by Nobuyoshi Nakada.

Description updated
Status changed from Open to Feedback

`Rational#floor` and `BigDecimal#floor` take a `precision` argument optionally, like as `Float#round`.

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Feature #10131: Greatest multiple of r not greater than x
https://bugs.ruby-lang.org/issues/10131#change-48331

* Author: Tsuyoshi Sawada
* Status: Feedback
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
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It happens too often to me that I want to calculate the greatest multiple of numeric r not greater than numeric x. This can be done by a simple operation below:

~~~ruby
x, r = 3.7, 0.5
x.div(r).*(r) #=> 3.5

x, r = 41, 6
x.div(r).*(r) #=> 36
~~~

but I encounter this operation so often that I think it is an essential operation, and should be done as a single operation. Can any of the existing zero-ary operation be extended to take an optional argument to do this calculation? For example

~~~ruby
3.7.floor(0.5) #=> 3.5
41.floor(6)    #=> 36
~~~



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