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# Creating a hash
old_syntax_hash = {:name => 'john'}
p old_syntax_hash

new_syntax_hash = { name: 'john'}
p new_syntax_hash

# Output>
# {:name=>"john"}
# {:name=>"john"}

# Example
hsh = colors = {
  "red" => 0xf00,
  "green" => 0x0f0,
  "blue" => 0x00f,
}

# Add new item
hsh[:white] = 0xfff

# Remove an item
hsh.delete(:green)

p hsh[:white] # > 4095

# Iterating over hashes
hsh.each do |key, value|
  print key, " is ", value, "\n"
end
# Output :
# red is 3840
# green is 240
# ...

# Merge two hashes
hsh2 ={
  "gold" =>  0xffd
}
hsh.merge!(hsh2)
p hsh
# {"red"=>3840, "green"=>240, "blue"=>15, :white=>4095, "gold"=>4093}