iteration.rb

# Arrays are ordered, integer-indexed collections of any object.
# Arrays are indexed starting at 0. Any negative index values are relative to the end of the array. For instance, an index of -1 is the last value in the array, -2 is the second last value in the array. 
# Arrays are useful for sequential information, things like lists, queues, etc.

zombie_apocalypse_supplies = ["hatchet", "rations", "water jug", "binoculars", "shotgun", "compass", "CB radio", "batteries"]

# 1. Iterate through the zombie_apocalypse_supplies array, printing each item in the array separated by an asterisk
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# 2. In order to keep yourself organized, sort your zombie_apocalypse_supplies in alphabetical order.
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# 3. Create a method to see if a particular item (string) is in the zombie_apocalypse_supplies, don't use any built in methods.
# For instance: are boots in your list of supplies?
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# 4. You can't carry too many things, you've only got room in your pack for 5. Remove items in your zombie_apocalypse_supplies in any way you'd like, leaving only 5.
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# 5. You found another survivor! This means you can combine your supplies. Create a new combined supplies list out of your zombie_apocalypse_supplies and their supplies below. You should get rid of any duplicate items. 
other_survivor_supplies = ["warm clothes", "rations", "compass", "camp stove", "solar battery", "flashlight"]
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# A Hash is a dictionary-like collection of unique keys and their values. Also called associative arrays, they are similar to Arrays, but where an Array uses integers as its index, a Hash allows you to use any object type. In other programming languages, they are sometimes called dictionaries.
# Hashes enumerate their values in the order that the corresponding keys were inserted.
# Hashes show relational data, we store data in key/value pairs.

extinct_animals = {"Tasmanian Tiger" => 1936, "Eastern Hare Wallaby" => 1890, "Dodo" => 1662, "Pyrenean Ibex" => 2000, "Passenger Pigeon" => 1914, "West African Black Rhinoceros" => 2011, "Laysan Crake" => 1923}

# 1. Iterate through extinct_animals, printing each key/value pair with a dash in between the key and value, and an asterisk between each pair
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# 2. Keep only animals in extinct_animals if they were extinct before the year 2000, don't use any special methods from the Hash module.
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# 3. Our calculations were completely off, turns out all of those animals went extinct 3 years before the date provided. Update the values in extinct_animals so they accurately reflect what year the animal went extinct.
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# 4. You've heard that the following animals might be extinct, but you're not sure. Check if they're included in extinct_animals, one by one:
# "Andean Cat"
# "Dodo"
# "Saiga Antelope"
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# 5. We just found out that the Passenger Pigeon is actually not extinct! Remove them from extinct_animals and return the key value pair as a two item array.
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