Square.rb

=begin

You like building blocks. You especially like building blocks that are squares.
And what you even like more, is to arrange them into a square of square building
blocks!

However, sometimes, you can't arrange them into a square. Instead, you end up
with an ordinary rectangle! Those blasted things! If you just had a way to know,
whether you're currently working in vain… Wait! That's it! You just have to
check if your number of building blocks is a perfect square.

Task

Given an integral number, determine if it's a square number:

In mathematics, a square number or perfect square is an integer that is the
square of an integer; in other words, it is the product of some integer with
itself.
The tests will always use some integral number, so don't worry about that in
dynamic typed languages.

Examples

is_square (-1) # => false
is_square   3 # => false
is_square   4 # => true
is_square  25 # => true
is_square  26 # => false

=end

# My Solution
def is_square(x)
  return false if x < 0
  Math.sqrt(x).to_s[-1] == "0" ? true : false
end

# Better Solution
def is_square(x)
  x < 0 ? false : Math.sqrt(x) % 1 == 0
end