Old High Score

10 Points

Instructions

In this exercise, you're implementing a way to keep track of the high scores for the most popular game in your local arcade hall.

1. Add players to the high score board

To add a player to the high score board, define two add_player! methods that take the following arguments:

The first argument is the dictionary of scores.
The second argument is the name of a player as a string.
The third argument is the score as an integer. This argument is optional, when no value is given, the score should be set to 0.

julia> scores = Dict{String, Int}()
Dict{String, Int64}()

julia> add_player!(scores, "Liselot", 486373)
Dict{String, Int64} with 1 entry:
  "Liselot" => 486373

julia> add_player!(scores, "Éimhín")
Dict{String, Int64} with 2 entries:
  "Liselot" => 486373
  "Éimhín"  => 0

2. Remove players from the score board

To remove a player from the high score board, define remove_player!, which takes 2 arguments:

The first argument is the dictionary of scores.
The second argument is the name of the player as a string.

julia> scores = Dict(
           "Liselot" => 486373,
           "Éimhín"  => 0,
       )
Dict{String, Int64} with 2 entries:
  "Liselot" => 486373
  "Éimhín"  => 0

julia> remove_player!(scores, "Liselot")
Dict{String, Int64} with 1 entry:
  "Éimhín" => 0

3. Update a player's score

To update a players score by replacing the previous score, define update_score!, which takes 3 arguments:

The first argument is the dictionary of scores.
The second argument is the name of the player as a string, whose score you wish to update.
The third argument is the score that you wish to set stored high score to.

julia> scores = Dict(
           "Liselot" => 486373,
           "Éimhín"  => 0,
       )
Dict{String, Int64} with 2 entries:
  "Liselot" => 486373
  "Éimhín"  => 0

julia> update_score!(scores, "Éimhín", 89479) # TODO: Should this return the dict?
89479

julia> scores
Dict{String, Int64} with 2 entries:
  "Liselot" => 486373
  "Éimhín"  => 89479

4. Reset a player's score

To reset a player's score, define reset_score!, which takes 2 arguments:

The first argument is the dictionary of scores.
The second argument is the name of the player as a string, whose score you wish to reset.

julia> scores = Dict(
           "Liselot" => 486373,
           "Éimhín"  => 0,
       )
Dict{String, Int64} with 2 entries:
  "Liselot" => 486373
  "Éimhín"  => 0

julia> reset_score!(scores, "Liselot") # TODO: Should this return the dict?
0

julia> scores
Dict{String, Int64} with 2 entries:
  "Liselot" => 0
  "Éimhín"  => 0

5. Get a list of players

To get a list of players, define players, which takes 1 argument:

The first argument is the dictionary of scores.

julia> scores = Dict(
           "Liselot" => 486373,
           "Éimhín"  => 0,
       )
Dict{String, Int64} with 2 entries:
  "Liselot" => 486373
  "Éimhín"  => 0

julia> players(scores)
2-element Vector{String}:
 "Liselot"
 "Éimhín"

julia