This is a demo application for providing a Fibonacci number at a given location. The application assumes a standard Fibonacci sequence [1, 1, 2, 3, 5, ...].

There are two methods used:

1. Generation
   1. Generate a Fibonacci sequence of length n
   2. Return the Fibonacci number at location v
2. Calculation
   1. Use a formula to calculate the Fibonacci number at location v (without generating the sequence).

The easiest way to run this program is via the Docker image.

docker run spncrgr/fibonacci help

This will pull the image from Docker Hub and print out it's usage:

Commands:
  fib calculate NUM   # Return the NUMth item in a standard Fibonacci sequence
  fib generate NUM    # generate a Fibonacci sequence and return the NUMth nu...
  fib help [COMMAND]  # Describe available commands or one specific command

If you have Ruby installed on your system, you can also run the application directly by cloning this repo.

$ git clone https://github.com/spncrgr/fibonacci.git
$ cd fibonacci
$ ruby exe/fib help

This will print out the same usage instructions as with the Docker image.

Note: The examples provide the commands for running via Docker image or Ruby, respectively.

$ docker run spncrgr/fibonacci generate 10
# OR
$ ruby exe/fib generate 10

OUTPUT:

Generating a sequence of 10 Fibonacci number(s)...
The Fibonacci number at entry 10 is 55

Time:
       user     system      total        real
   0.000041   0.000003   0.000044 (  0.000012)

$ docker run spncrgr/fibonacci calculate 10
# OR
$ ruby exe/fib calculate 10

OUTPUT:

The Fibonacci number at position 10 of a standard
sequence is 55

Time:
       user     system      total        real
   0.000166   0.000154   0.000320 (  0.000675)