Left Rotate an Array

left.rb

#!/bin/ruby

require 'json'
require 'stringio'

# Complete the rotLeft function below.
def rotLeft(a, d)
    out = Array.new(a.length)
    (0..a.length-1).each do |i|
        new_location = (i + (a.length - d)) % a.length
        out[new_location] = a[i]
    end
    out
end

fptr = File.open(ENV['OUTPUT_PATH'], 'w')

nd = gets.rstrip.split

n = nd[0].to_i

d = nd[1].to_i

a = gets.rstrip.split(' ').map(&:to_i)

result = rotLeft a, d

fptr.write result.join " "
fptr.write "\n"

fptr.close()