Mappings and Solidity Contract

Question 1

mapping(_KeyType => _ValueType)

Answer 1

defines a way to assign values to keys. Similar to arrays, but keys can be any. type and do not have a predefined range. Very flexible

Question 2

_KeyType

Answer 2

can be almost any type except for a mapping, a dynamically sized array, a contract, an enum and a struct

Question 3

_ValueType

Answer 3

can actually be any. type, including mappings

Question 4

Contract

Answer 4

a collection of codes (fuctions) and data (states) located at a specific address on the Etherum blockchain

Question 5

Contract is similar to

Answer 5

a class in object-oriented language