Security News
Research
Data Theft Repackaged: A Case Study in Malicious Wrapper Packages on npm
The Socket Research Team breaks down a malicious wrapper package that uses obfuscation to harvest credentials and exfiltrate sensitive data.
fibonacci_enumerator
Advanced tools
This gems adds FibonacciEnumerator
, an Enumerable class that makes it possible
to efficiently calculate elements of the Fibonacci sequence.
It is an Enumerable object so it can be iterated through using each
and implements methods like first
, select
, map
etc.
Install the gem and add to the application's Gemfile by executing:
$ bundle add fibonacci_enumerator
If bundler is not being used to manage dependencies, install the gem by executing:
$ gem install fibonacci_enumerator
Elements of the Fibonacci sequence are calculated using the dynamic programming approach.
Instances of FibonacciEnumerator
contain a cache that accumulates already calculated
elements of the sequence.
You can use the FibonacciEnumerator
class directly as an Enumerable
object for convenience.
The at
method aliases as []
can be used to get a particular element of the sequence.
FibonacciEnumerator.at(1) #=> 1
FibonacciEnumerator.at(2) #=> 1
FibonacciEnumerator.at(3) #=> 2
FibonacciEnumerator.at(4) #=> 3
FibonacciEnumerator.at(5) #=> 5
FibonacciEnumerator.at(6) #=> 8
FibonacciEnumerator[1] #=> 1
FibonacciEnumerator[2] #=> 1
FibonacciEnumerator[3] #=> 2
FibonacciEnumerator[4] #=> 3
FibonacciEnumerator[5] #=> 5
FibonacciEnumerator[6] #=> 8
You can also pass a Range
.
FibonacciEnumerator.at(4..7) #=> [3, 5, 8, 13]
FibonacciEnumerator[4..7] #=> [3, 5, 8, 13]
You can iterate through the Fibonacci series. Keep in mind that it's infinite, so the loop will go on forever unless manually interrupted
FibonacciEnumerator.each do |element|
puts element
end
# 1
# 1
# 2
# 3
# 8
# ...
You can filter elements using select
or reject
FibonacciEnumerator.first(25).select(&:even?)
#=> [0, 2, 8, 34, 144, 610, 2584, 10946, 46368]
This class is Enumerable
so methods like each
, select
, reject
, take
etc
are available as well.
When you want to manually get particular elements of the Fibonacci sequence you can save some time by sharing the cache between calculations.
You can do that by creating an instance of FibonacciEnumerator
.
fib = FibonacciEnumerator.new
fib[10]
#=> 55
fib[10] # cache is reused, no calculations were necessary!
#=> 55
fib[15] # the first 10 elements were already calculated, so its faster
#=> 610
Instances are also Enumerable
objects so methods like each
, select
, reject
, take
etc
are available as well.
After checking out the repo, run bin/setup
to install dependencies. Then, run rake test
to run the tests. You can also run bin/console
for an interactive prompt that will allow you to experiment.
To install this gem onto your local machine, run bundle exec rake install
. To release a new version, update the version number in version.rb
, and then run bundle exec rake release
, which will create a git tag for the version, push git commits and the created tag, and push the .gem
file to rubygems.org.
Bug reports and pull requests are welcome on GitHub at https://github.com/Verseth/ruby-fibonacci_enumerator.
The gem is available as open source under the terms of the MIT License.
FAQs
Unknown package
We found that fibonacci_enumerator demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
Research
The Socket Research Team breaks down a malicious wrapper package that uses obfuscation to harvest credentials and exfiltrate sensitive data.
Research
Security News
Attackers used a malicious npm package typosquatting a popular ESLint plugin to steal sensitive data, execute commands, and exploit developer systems.
Security News
The Ultralytics' PyPI Package was compromised four times in one weekend through GitHub Actions cache poisoning and failure to rotate previously compromised API tokens.