high-score-board v2

high-score-board/.exercism/config.json

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+{
+  "authors": [
+    "lpil"
+  ],
+  "files": {
+    "solution": [
+      "src/high_score_board.gleam"
+    ],
+    "test": [
+      "test/high_score_board_test.gleam"
+    ],
+    "exemplar": [
+      ".meta/example.gleam"
+    ],
+    "invalidator": [
+      "gleam.toml",
+      "manifest.toml"
+    ]
+  },
+  "forked_from": [
+    "javascript/high-score-board"
+  ],
+  "blurb": "Practice Gleam dicts by tracking high scores of an arcade game."
+}

high-score-board/.exercism/metadata.json

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+{"track":"gleam","exercise":"high-score-board","id":"51923a5987d74c51bcec5743a623c549","url":"https://exercism.org/tracks/gleam/exercises/high-score-board","handle":"fw353qwgs","is_requester":true,"auto_approve":false}

high-score-board/.gitignore

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+*.beam
+*.ez
+build
+erl_crash.dump

high-score-board/HELP.md

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+# Help
+
+## Running the tests
+
+To run the tests, run the command `gleam test` from within the exercise directory.
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit src/high_score_board.gleam` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [Gleam track's documentation](https://exercism.org/docs/tracks/gleam)
+- The [Gleam track's programming category on the forum](https://forum.exercism.org/c/programming/gleam)
+- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+To get help if you're having trouble, you can use one of the following resources:
+
+- [gleam.run](https://gleam.run/documentation/) is the gleam official documentation.
+- [Discord](https://discord.gg/Fm8Pwmy) is the discord channel.
+- [StackOverflow](https://stackoverflow.com/questions/tagged/gleam) can be used to search for your problem and see if it has been answered already. You can also ask and answer questions.

high-score-board/HINTS.md

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+# Hints
+
+## 1. Create a new high score board
+
+- The [`dict.new`][new] and [`dict.from_list`][from_list] functions can be used to create a new dict.
+
+## 2. Add players to a score board
+
+- The [`dict.insert`][insert] function can be used to add a new key-value pair to a dict.
+
+## 3. Remove players from a score board
+
+- The [`dict.delete`][delete] function can be used to remove a key-value pair from a dict.
+
+## 4. Increase a player's score
+
+- The [`dict.get`][get] function can be used to get the value for a key in a dict.
+- The [`dict.insert`][insert] function can be used to overwrite an existing key-value pair in a dict.
+
+## 5. Apply Monday bonus points
+
+- The [`dict.map_values`][map_values] function can be used to modify all the values in a dict.
+
+[new]: https://hexdocs.pm/gleam_stdlib/gleam/dict.html#new
+[get]: https://hexdocs.pm/gleam_stdlib/gleam/dict.html#get
+[insert]: https://hexdocs.pm/gleam_stdlib/gleam/dict.html#insert
+[delete]: https://hexdocs.pm/gleam_stdlib/gleam/dict.html#delete
+[from_list]: https://hexdocs.pm/gleam_stdlib/gleam/dict.html#from_list
+[map_values]: https://hexdocs.pm/gleam_stdlib/gleam/dict.html#map_values

high-score-board/README.md

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+# High Score Board
+
+Welcome to High Score Board on Exercism's Gleam Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+If you get stuck on the exercise, check out `HINTS.md`, but try and solve it without using those first :)
+
+## Introduction
+
+## Type Aliases
+
+### Type aliases
+
+A type alias can be used in Gleam to give a convenient name for an existing type that would be otherwise cumbersome to write.
+
+```gleam
+pub type Headers =
+  List(#(String, String))
+
+pub fn html_headers() -> Headers {
+  [
+    #("content-type", "text/html"),
+    #("x-frame-options", "DENY"),
+  ]
+}
+```
+
+When written with `pub type` the alias can be used outside of the module it is defined in. If `pub` is omitted then the alias is private and cannot be referenced in other modules.
+
+## Dicts
+
+Dicts in Gleam are the data structure for storing information in key-value pairs. In other languages, these might also be known as associative arrays, hashes, or dictionaries.
+
+Any type can be used for the keys and values in a dict, and they do not guarantee the order of their entries when accessed or returned.
+
+### Working with dicts
+
+Dicts are created and manipulated using functions from the `gleam/dict` module.
+
+```gleam
+// Create an empty dict
+let dict1 = dict.new()
+
+// Create a dict with some values
+let dict2 = dict.from_list([
+  #("name", "Gleam"),
+  #("colour", "Pink"),
+])
+
+// Add a value to a dict
+let dict3 = dict.insert(dict2, "website", "https://gleam.run")
+
+// Get a value from a dict
+let name = dict.get(dict3, "name")
+// -> Ok("Gleam")
+```
+
+## Instructions
+
+In this exercise, you are implementing a way to keep track of the high scores for the most popular game in your local arcade hall.
+
+You have 5 functions to implement, mostly related to manipulating an object that holds high scores.
+
+## 1. Create a new high score board
+
+Create a function `create_score_board` that returns a dict that serves as a high score board.
+The keys of this object will be the names of the players, the values will be their scores.
+For testing purposes, you want to directly include one entry in the object.
+This initial entry should consist of `"The Best Ever"` as player name and `1_000_000` as score.
+
+```gleam
+create_score_board()
+// returns an object with one initial entry
+```
+
+## 2. Add players to a score board
+
+To add a player to the high score board, define the function `add_player`.
+It accepts 3 parameters:
+
+- The first parameter is an existing score board dict.
+- The second parameter is the name of a player as a string.
+- The third parameter is the score as an int.
+
+The function returns a dict with the new player and score added.
+
+## 3. Remove players from a score board
+
+If players violate the rules of the arcade hall, they are manually removed from the high score board.
+Define `remove_player` which takes 2 parameters:
+
+- The first parameter is an existing score board dict.
+- The second parameter is the name of the player as a string.
+
+This function should return the dict without the player that was removed.
+
+If the player was not on the board in the first place, nothing should happen to the board, it should be returned as is.
+
+## 4. Increase a player's score
+
+If a player finishes another game at the arcade hall, a certain amount of points will be added to the previous score on the board.
+Implement `update_score`, which takes 3 parameters:
+
+- The first parameter is an existing score board dict.
+- The second parameter is the name of the player whose score should be increased.
+- The third parameter is the score that you wish to **add** to the stored high score.
+
+The function should return a dict with the updated score.
+
+If the player was not on the board in the first place, nothing should happen to the board, it should be returned as is.
+
+## 5. Apply Monday bonus points
+
+The arcade hall keeps a separate score board on Mondays.
+At the end of the day, each player on that board gets 100 additional points.
+
+Implement the function `apply_monday_bonus` that accepts a score board.
+The function returns a dict with the bonus points added for each player that is listed on that board.
+
+## Source
+
+### Created by
+
+- @lpil

high-score-board/gleam.toml

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+name = "high_score_board"
+version = "0.1.0"
+
+[dependencies]
+gleam_otp = "~> 0.7 or ~> 1.0"
+gleam_stdlib = ">= 0.54.0 or ~> 1.0"
+simplifile = "~> 1.0"
+gleam_erlang = ">= 0.25.0 and < 1.0.0"
+gleam_yielder = ">= 1.1.0 and < 2.0.0"
+gleam_regexp = ">= 1.1.0 and < 2.0.0"
+gleam_deque = ">= 1.0.0 and < 2.0.0"
+
+[dev-dependencies]
+exercism_test_runner = "~> 1.9"

high-score-board/manifest.toml

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+# This file was generated by Gleam
+# You typically do not need to edit this file
+
+packages = [
+  { name = "argv", version = "1.0.2", build_tools = ["gleam"], requirements = [], otp_app = "argv", source = "hex", outer_checksum = "BA1FF0929525DEBA1CE67256E5ADF77A7CDDFE729E3E3F57A5BDCAA031DED09D" },
+  { name = "exercism_test_runner", version = "1.9.0", build_tools = ["gleam"], requirements = ["argv", "gap", "glance", "gleam_community_ansi", "gleam_erlang", "gleam_json", "gleam_stdlib", "simplifile"], otp_app = "exercism_test_runner", source = "hex", outer_checksum = "0B17BB25F2FF1E60266467C24FE0CA04005410306AA05E9A4B41B1852D72865C" },
+  { name = "filepath", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "filepath", source = "hex", outer_checksum = "67A6D15FB39EEB69DD31F8C145BB5A421790581BD6AA14B33D64D5A55DBD6587" },
+  { name = "gap", version = "1.1.3", build_tools = ["gleam"], requirements = ["gleam_community_ansi", "gleam_stdlib"], otp_app = "gap", source = "hex", outer_checksum = "6EF5E3B523FDFBC317E9EA28D5163EE04744A97C007106F90207569789612291" },
+  { name = "glance", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_stdlib", "glexer"], otp_app = "glance", source = "hex", outer_checksum = "E155BA1A787FD11827048355021C0390D2FE9A518485526F631A9D472858CC6D" },
+  { name = "gleam_community_ansi", version = "1.4.3", build_tools = ["gleam"], requirements = ["gleam_community_colour", "gleam_regexp", "gleam_stdlib"], otp_app = "gleam_community_ansi", source = "hex", outer_checksum = "8A62AE9CC6EA65BEA630D95016D6C07E4F9973565FA3D0DE68DC4200D8E0DD27" },
+  { name = "gleam_community_colour", version = "2.0.0", build_tools = ["gleam"], requirements = ["gleam_json", "gleam_stdlib"], otp_app = "gleam_community_colour", source = "hex", outer_checksum = "FDD6AC62C6EC8506C005949A4FCEF032038191D5EAAEC3C9A203CD53AE956ACA" },
+  { name = "gleam_deque", version = "1.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_deque", source = "hex", outer_checksum = "64D77068931338CF0D0CB5D37522C3E3CCA7CB7D6C5BACB41648B519CC0133C7" },
+  { name = "gleam_erlang", version = "0.34.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "0C38F2A128BAA0CEF17C3000BD2097EB80634E239CE31A86400C4416A5D0FDCC" },
+  { name = "gleam_json", version = "2.3.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_json", source = "hex", outer_checksum = "C55C5C2B318533A8072D221C5E06E5A75711C129E420DD1CE463342106012E5D" },
+  { name = "gleam_otp", version = "0.16.1", build_tools = ["gleam"], requirements = ["gleam_erlang", "gleam_stdlib"], otp_app = "gleam_otp", source = "hex", outer_checksum = "50DA1539FC8E8FA09924EB36A67A2BBB0AD6B27BCDED5A7EF627057CF69D035E" },
+  { name = "gleam_regexp", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_regexp", source = "hex", outer_checksum = "7F5E0C0BBEB3C58E57C9CB05FA9002F970C85AD4A63BA1E55CBCB35C15809179" },
+  { name = "gleam_stdlib", version = "0.55.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "32D8F4AE03771516950047813A9E359249BD9FBA5C33463FDB7B953D6F8E896B" },
+  { name = "gleam_yielder", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_yielder", source = "hex", outer_checksum = "8E4E4ECFA7982859F430C57F549200C7749823C106759F4A19A78AEA6687717A" },
+  { name = "glexer", version = "2.2.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "glexer", source = "hex", outer_checksum = "5C235CBDF4DA5203AD5EAB1D6D8B456ED8162C5424FE2309CFFB7EF438B7C269" },
+  { name = "simplifile", version = "1.7.0", build_tools = ["gleam"], requirements = ["filepath", "gleam_stdlib"], otp_app = "simplifile", source = "hex", outer_checksum = "1D5DFA3A2F9319EC85825F6ED88B8E449F381B0D55A62F5E61424E748E7DDEB0" },
+]
+
+[requirements]
+exercism_test_runner = { version = "~> 1.9" }
+gleam_deque = { version = ">= 1.0.0 and < 2.0.0" }
+gleam_erlang = { version = ">= 0.25.0 and < 1.0.0" }
+gleam_otp = { version = "~> 0.7 or ~> 1.0" }
+gleam_regexp = { version = ">= 1.1.0 and < 2.0.0" }
+gleam_stdlib = { version = ">= 0.54.0 or ~> 1.0" }
+gleam_yielder = { version = ">= 1.1.0 and < 2.0.0" }
+simplifile = { version = "~> 1.0" }

high-score-board/src/high_score_board.gleam

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+import gleam/dict.{type Dict}
+
+pub type ScoreBoard =
+  Dict(String, Int)
+
+pub fn create_score_board() -> ScoreBoard {
+  dict.from_list([#("The Best Ever", 1_000_000)])
+}
+
+pub fn add_player(
+  score_board: ScoreBoard,
+  player: String,
+  score: Int,
+) -> ScoreBoard {
+  dict.insert(score_board, player, score)
+}
+
+pub fn remove_player(score_board: ScoreBoard, player: String) -> ScoreBoard {
+  dict.delete(score_board, player)
+}
+
+pub fn update_score(
+  score_board: ScoreBoard,
+  player: String,
+  points: Int,
+) -> ScoreBoard {
+  case dict.get(score_board, player) {
+    Error(_) -> score_board
+    Ok(score) -> dict.insert(score_board, player, score + points)
+  }
+}
+
+pub fn apply_monday_bonus(score_board: ScoreBoard) -> ScoreBoard {
+  dict.map_values(score_board, fn(_, score) { score + 100 })
+}

high-score-board/test/high_score_board_test.gleam

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+import exercism/should
+import exercism/test_runner
+import gleam/dict
+import high_score_board
+
+pub fn main() {
+  test_runner.main()
+}
+
+pub fn create_score_board_test() {
+  high_score_board.create_score_board()
+  |> should.equal(dict.from_list([#("The Best Ever", 1_000_000)]))
+}
+
+pub fn add_player_board_test() {
+  [#("Amil Pastorius", 99_373), #("Min-seo Shin", 0)]
+  |> dict.from_list
+  |> high_score_board.add_player("Jessie Johnson", 1337)
+  |> should.equal(
+    dict.from_list([
+      #("Amil Pastorius", 99_373),
+      #("Min-seo Shin", 0),
+      #("Jessie Johnson", 1337),
+    ]),
+  )
+}
+
+pub fn remove_player_test() {
+  [#("Amil Pastorius", 99_373), #("Min-seo Shin", 0), #("Jesse Johnson", 1337)]
+  |> dict.from_list
+  |> high_score_board.remove_player("Jesse Johnson")
+  |> should.equal(
+    dict.from_list([#("Amil Pastorius", 99_373), #("Min-seo Shin", 0)]),
+  )
+}
+
+pub fn remove_player_unknown_test() {
+  let board =
+    dict.from_list([
+      #("Amil Pastorius", 99_373),
+      #("Min-seo Shin", 0),
+      #("Jesse Johnson", 1337),
+    ])
+
+  board
+  |> high_score_board.remove_player("Bruno Santangelo")
+  |> should.equal(board)
+}
+
+pub fn update_score_test() {
+  [#("Amil Pastorius", 99_373), #("Min-seo Shin", 0), #("Jesse Johnson", 1337)]
+  |> dict.from_list
+  |> high_score_board.update_score("Min-seo Shin", 1999)
+  |> high_score_board.update_score("Jesse Johnson", 1337)
+  |> high_score_board.update_score("Unknown player", 1)
+  |> should.equal(
+    dict.from_list([
+      #("Amil Pastorius", 99_373),
+      #("Min-seo Shin", 1999),
+      #("Jesse Johnson", 2674),
+    ]),
+  )
+}
+
+pub fn apply_monday_bonus_test() {
+  [#("Amil Pastorius", 345), #("Min-seo Shin", 19), #("Jesse Johnson", 122)]
+  |> dict.from_list
+  |> high_score_board.apply_monday_bonus
+  |> should.equal(
+    dict.from_list([
+      #("Amil Pastorius", 445),
+      #("Min-seo Shin", 119),
+      #("Jesse Johnson", 222),
+    ]),
+  )
+}