vicanis / golang-united-school-homework-5.2

Cache

Implement a simple cache, that holds values with type string and allows to retrieve them using keys of time stings. Key/value pairs can expire if given a deadline using an appropriate method.

The initial structure is given. You should add appropriate fields, implement the constructor function and methods with given signatures.

k, ok := Get(key string) - returns the value associated with the key and the boolean ok (true if exists, false if not), if the deadline of the key/value pair has not been exceeded yet

Put(key string, value string) places a value with an associated key into cache. Value put with this method never expired(have infinite deadline). Putting into the existing key should overwrite the value

PutTill(key string, value string, deadline time.Time) Should do the same as Put, but the key/value pair should expire by given deadline

Keys() []string should return the slice of existing (non-expired keys)

The expiration should, and probably cannot in our case, be implemented asynchronously, so think of a way to clean up the records when needed

NOTE: receiver is a placeholder, replace appropriately