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# Use this script to test that your Telegram bot works.
#
# Install the dependency
#
#   $ gem install telegram_bot
#
# Run the bot
#
#   $ ruby bot.rb
#

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// NodeJS
const assert = require('assert');

/**
 * Flatten an array of arbitrarily nested arrays of integers into a flat array of integers.
 * e.g. [[1,2,[3]],4] -> [1,2,3,4]. 
 * 
 * @name flatten
 * @param {Array} arr An array to flatten, nested or otherwise
 * @returns {Array} the flattened array

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Nodej in deep

This article is for those who have basic knowledge of javascript

Javascript aside

Javascript thinks you should know to make sure you understand nodejs properly