Question

I’m trying to implement the following code in Ruby and getting stuck on it.

I’ve looked at documentation but they all deal with a string rather than an object.

PHP code:

if ( substr($new_price, -2) != '00' ) {

Ruby code I tried:

if new_price[-2,2] != '00'
if new_price.to_s.slice[-2,2] != '00'

---

Edit:

For current usage, which is just to check to see if a price has decimals or not, I switched to this:

if new_price.ceil != new_price

I am still curious how to do this properly in Ruby.

Answer 1

In Ruby you can get the last two elements of a string with (for example) this code:

price = '200'
puts price[-2..-1]
#=> 00

You could also add the last(n) method to the String class, like so:

class String
  def last(n)
    self[-n..-1] || self
  end
end

Then you could write code like this:

puts price.last(2)
#=> 00

puts price.last(100)
#=> 200