From: Robert Klemme <bob.news@...>
Date: 2005-09-25T02:26:41+09:00
Subject: Re: cannot convert Float into String

Devin Mullins <twifkak@comcast.net> wrote:
> Robert Klemme wrote:
>
>> Nick <glenn.brutyn@telenet.be> wrote:
>>
>>> i am making a pdf file, retrieving an product for the db and print
>>> the price in the pdf
>>>
>>> @product = Product.find(@params["id"])
>>>
>>> pdf.SetFont('Arial','',10)
>>> pdf.Cell(3,h, "?",0,0)
>>> pdf.Cell(100,h, " " + @product.price , 0,1)
>>
>>
>> pdf.Cell(100,h, @product.price.to_s , 0,1)
>> pdf.Cell(100,h, " %4.1f" % @product.price , 0,1)
>> pdf.Cell(100,h, sprintf(" %4.1f", @product.price) , 0,1)
>
> Add to that:
> pdf.Cell(100,h, "#{@product.price}", 0,1)

Although I agree to the rest of your posting this variant is inefficient if 
you just want to convert a float into a string.

$ ruby -r benchmark -e 'x=1.34;Benchmark.bm(20) {|bm| bm.report("to_s") 
{10000.times{ x.to_s }}; bm.report("##"){10000.times{"#{x}"
}} }'
                          user     system      total        real
to_s                  0.438000   0.000000   0.438000 (  0.430000)
##                    0.500000   0.000000   0.500000 (  0.491000)

Kind regards

    robert