Hashes and symbols

Question 1

how to create a new hash?

Answer 1

my_hash = Hash.new
or
my_hash = {}

Question 2

how to iterate through a hash?

Answer 2

my_hash.each do |key, value|
puts key, my_hash[key]
end

Question 3

create a new hash with a default value “test”.

Answer 3

my_hash = Hash.new(“test”)

Question 4

how to convert a string to a symbol and vice versa?

Answer 4

:mina.to_s

“mina”.to_sym or “mina”.intern

Question 5

how to filer a hash for values that meet a certain criteria?

Answer 5

my_hash.select { |key, value| value

Question 6

how to iterate through each key or each value only?

Answer 6

my_hash.each_key
or
my_hash.each_value

Question 7

how to delete a pair from a hash?

Answer 7

my_hash.delete(“key”)