Ruby_Syntax_Learning.arb

#Initial Test document, learning basic Ruby usage, scripting
#Made while reading through https://www.theodinproject.com/paths/full-stack-ruby-on-rails/courses/ruby-programming

test1 = 2

puts test1.inspect

test1 **= 2

puts test1
print "Hello World"; print "I love drinking coffee\n"
puts "Hello World"; puts "I love drinking coffee"



#test2 = gets.chomp
#put test2

if test1 > 6
    puts "test1 > 6"
else
    puts "test1 <= 6"
end

test3 = 2
test3 += 2


puts test1.equal?test3 #pointer comparison, for numbers = true due to optimization

test1 = "hello"
test3 = "hello"
puts test1.equal?test3

puts 3 <=> 3 #"spaceship operator", returns -1, 0, 1 by larger value


response = 2 < 3 ? "2 < 3 = true" : " 2 < 3 = false"
puts response

i=0
#loop do
while i < 6 do  #loop to 5
    i+=1
end
puts "i = #{i}"

i=0
until i >= 4 do  #Loop to 3
    i+=1
    #break if i == 5
end
puts "i = #{i}"


for j in ('a'..'e') # 1..5 #for 1-5
    puts "for loop: j = #{j}"
end


#dictionary/map
hash = Hash.new
hash = {
    #"a" => 1,
    #"b" => 2
    :a => 1,
    :b => 2

    #a:  1, ... ; still access with hash[:a]
}
hash[:c] = 500
hash.delete(:c)
puts hash.fetch(:b, -1)
puts hash.fetch(:c, -1)
#hash["b"]
#hash["no"] # = nil
#hash.fetch("no", "default value") # gives a keyerror w/o default


def greet(name)
    "Hello, " + name + "!" #implicit returns
    #return ^ also works
end
puts greet("Morgan")

def even_odd(number)
    unless number.is_a? Numeric
        return "not a number"
    end

    if number % 2 == 0
        "even"
    else
        "odd"
    end
end
puts even_odd("blarg")

# puts 5.even? # predicate methods end w/ "?"", return true/false

array = [5,3,2,5]
array.each do |num|
    num **= 2
    puts "squared array value = #{num}"
end


my_hash = Hash.new(100) #sets default value to 100
puts my_hash["cc"]
my_hash = { "aa" => 1, "bb" => 2}
puts my_hash["cc"]
my_hash.each { |key, value| puts "#{key} hash to #{value}" }
my_hash.each { |pair| puts "pair hash to #{pair} aka #{pair[1]} and #{pair[0]}" }

array = ["a", "b", "c", "d"]
array.each_with_index { |fruit, index| puts fruit if index.even?}

my_numbers = [5, 6, 7, 8]
#sum = 0
puts my_numbers.reduce(1000) { |sum, number| sum + number } # .reduce(1000) for 1026
#puts sum

puts array.select { |value| value < "c"}

puts "Testing objects"

class TestObject
    @@total_indices = 0

    def initialize(initial_values)
        @values = initial_values.to_a
        @@total_indices += initial_values.length
    end

    def push(value)
        @values.push(value)
        @@total_indices += 1
    end

    def get_index_value(index)
        @values[index]
    end

    def get_total_indices()
        @@total_indices
    end
end

test1 = TestObject.new([1,2,3])
test2 = TestObject.new((5..12).to_a)

puts test2.get_total_indices()

puts test1.get_index_value(1)
test1.push(4)
puts test1.get_index_value(3)


puts test2.get_total_indices()









puts "end"