CODEWITHSUNDEEP
ruby-on-railsruby
equivalent8
equivalent8

Reputation: 14227

how to do number to string suffix

As you know in ruby you can do 

"%03d" % 5
#=>  "005"

"%03d" % 55
#=> "055"

"%03d" % 555
#=> "555"

so basically number will have "0" prefix for 3 string places

just wondering is there possibility to do number string suffix in similar nice way ? (please no if statements) 

something 5
#=> 500

something 55
#=> 550

something 555
# => 555

Upvotes: 5

Views: 960

Answers (2)

Frank Schmitt
Frank Schmitt

Reputation: 30765

How about 

  def prettify(n)
    ("%03d" % (n.to_s.reverse.to_i)).to_s.reverse
  end

which

  • converts your number to string
  • reverses it
  • converts it back to a number
  • formats it
  • converts it back to an int
  • reverses it again

Maintaining this piece of code might become a challenge a few months from now, of course :-)

Upvotes: 0

keymone
keymone

Reputation: 8094

how about ljust method?

"5".ljust(3, "0")

and some to_s and to_i method calls if you want to do that to integers

you could avoid string conversion with bit more math like log_10 to find number of digits in an integer and then i *= 10**x where x is how many more 0's you need

like this:

def something(int, power=3)
  int * 10**([power - Math.log10(int).to_i - 1, 0].max)
end

Upvotes: 7

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