Ruby memorandum (acquisition of key value)

To get the key or value contained in the hash There is a method prepared in advance.

keys and values methods
Object .keys Object .values

`qiita.rb`


puts hash.keys
puts hash.values

This will output all the keys and values contained in the hash.

Given the hash {A: "a"} If you want to retrieve the key A, put the value a paired with A in (). Conversely, if you want to retrieve the value a, put the key A paired with a in ().

`qiita.rb`


hash = { ringo: "apple", mikan: "orange", ichigo: "Strawberry" }

puts hash.key("apple") 
#「ringo: "apple"Is the value of"apple"From the key ringo:Get
puts hash.values_at(:ringo) 
# 「ringo: "apple"Is the key":ringo"From the value"apple"Get

Isn't it possible to retrieve by number like an array? to be continued.

Reference site https://www.javadrive.jp/ruby/hash/index8.html https://qiita.com/kidach1/items/651b5b5580be40ad047e