Chapter 3 - Maps, Sets and Keywords

Question 1

Function to create a new map

Answer 1

hash-map (unordered map) OR sorted-map (ordered map)

Question 2

Function to get a value of a map

Answer 2

get

ex: (get book “author”) OR SIMPLY (book “author”)

Question 3

Keywords

Answer 3

basic data type that comes packaged with Clojure.

:key

Question 4

Function to “add” a new key to a map (or vector) or to “change” a value associated with it

Answer 4

assoc

ex: (assoc book :pages 220)

Question 5

Function to “remove” a key (or keys) of a map (or vector)

Answer 5

dissoc

ex: (dissoc book :pages)

Question 6

Function to get all keys in a map

Answer 6

keys

ex: (keys books)

Question 7

Function to get all values in a map

Answer 7

vals

ex: (vals books)

Question 8

Function to check set membership

Answer 8

contains?

ex: (contains? books “1984”)

Question 9

Function to “add” a value to a set

Answer 9

conj

ex: (conj books “Brave New World”)

Question 10

Function to “remove” a value from a set

Answer 10

disj

ex: (disj books “1984”)