Library Report

Part of the Object Oriented Programming section of Coddy's R journey. Lesson 54 of 57.

Challenge

Medium

Add the REPORT command through the method report_lines(). Keep every command from the previous steps working exactly as before.

REPORT: reply books: 3, borrowed: 1, then one line per member in alphabetical order: ada: Dune, Emma with the titles in borrowing order, or bo: none.

The supplied code sends every input line to lib$handle(line) and prints each returned reply on its own line. Member names are single lower-case words, book ids are whole numbers, and the input holds only the commands described so far. Any other command replies unknown command.

Your code goes in Book.R, Member.R and Library.R. main.R holds the supplied input/output code and cannot be edited.

Try it yourself

source("Book.R")
source("Member.R")
source("Library.R")

# Supplied input/output code: keep it as it is
input <- suppressWarnings(readLines(file("stdin")))
lib <- Library$new()
for (line in input) {
  for (reply in lib$handle(line)) cat(reply, "\n", sep = "")
}