guessing-game

guessing-game/.exercism/config.json

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+{
+  "authors": [
+    "lpil"
+  ],
+  "files": {
+    "solution": [
+      "src/guessing_game.gleam"
+    ],
+    "test": [
+      "test/guessing_game_test.gleam"
+    ],
+    "exemplar": [
+      ".meta/example.gleam"
+    ],
+    "invalidator": [
+      "gleam.toml",
+      "manifest.toml"
+    ]
+  },
+  "forked_from": [
+    "fsharp/guessing-game"
+  ],
+  "blurb": "Learn about case expressions by implementing a simple game in which the player needs to guess a secret number"
+}

guessing-game/.exercism/metadata.json

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+{"track":"gleam","exercise":"guessing-game","id":"b9bfee8ac59540e181cca949a9681fb2","url":"https://exercism.org/tracks/gleam/exercises/guessing-game","handle":"fw353qwgs","is_requester":true,"auto_approve":false}

guessing-game/.gitignore

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

guessing-game/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/guessing_game.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.

guessing-game/HINTS.md

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+# Hints
+
+## General
+
+- [This page][case-expressions] has a nice introduction to case expressions in Gleam.
+
+## 1. Reply to a correct guess
+
+- You can use a literal pattern to match on a specific number.
+
+## 2. Reply to a close guess
+
+- You can either use a literal pattern or a variable pattern and a guard.
+
+## 3. Reply to too low guesses
+
+- You can use a combination of a variable pattern and a guard.
+
+## 4. Reply to too high guesses
+
+- You can use a combination of a variable pattern and a guard, or a discard pattern.
+
+[case-expressions]: https://gleam.run/book/tour/case-expressions.html

guessing-game/README.md

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+# Guessing Game
+
+Welcome to Guessing Game 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
+
+## Case Expressions
+
+In Gleam a `case` expression can be used to conditionally execute code. With a case expression a value can be tested against one or more _patterns_. An example of such a pattern is the _literal pattern_, which matches a value against a literal value (e.g. `1` or `"hello"`).
+
+Case expressions are written with the `case` keyword:
+
+```gleam
+pub fn describe(number: Int) -> String {
+  case number {
+    0 -> "Zero"
+    1 -> "One"
+  }
+}
+```
+
+While this may look like `switch` statements in other languages, pattern matching starts to shine when also using other patterns. One such pattern is the _variable pattern_, which allows one to assign a value to a variable. In this example, the variable `i` will be assigned the value of `number` if it is not `0`:
+
+```gleam
+pub fn describe(number: Int) -> String {
+  case number {
+    0 -> "Zero"
+    i -> "Non zero"
+  }
+}
+```
+
+In some cases, you may want to add an additional condition to a pattern. This is known as a _guard_ (clause), which can be added using the `if` keyword:
+
+```gleam
+pub fn describe(number: Int) -> String {
+  case number {
+    0 -> "Zero"
+    i if i < 0 -> "Negative number"
+  }
+}
+```
+
+For performance reasons only basic mathematical and boolean operators are allowed in guards, other functions cannot be used in guards.
+
+In the above example, not all possible input will have a matching pattern. The compiler will detect this and output an error. This is known as _exhaustive checking_. To solve the warning, one has to handle all cases. For this, the _discard pattern_ can be used, which is a pattern that matches on any value:
+
+```gleam
+pub fn describe(number: Int) -> String {
+  case number {
+    0 -> "Zero"
+    i if i < 0 -> "Negative number"
+    _ -> "Positive number"
+  }
+}
+
+// No compiler error
+```
+
+Multiple patterns can be matched against in one clause using the `|` to separate between each pattern. Only one guard can be added to a clause:
+
+```gleam
+pub fn describe(number: Int) -> String {
+  let yell = True
+  case number {
+    0 -> "Zero"
+    3 | 5 -> "One of the first odd prime numbers"
+    2 | 4 | 6 | 8 if !yell -> "One of the even numbers less than 10"
+    i if i % 2 == 0 && yell -> "[Yelling] I'm telling you! It's a even nunber"
+    i if i < 0 -> "Negative number"
+    _ -> "Positive number"
+  }
+}
+// No compiler error
+```
+
+Case expressions will test a value against each pattern from top to bottom, until it finds a matching pattern and executes the logic associated with that pattern. The order of patterns matters!
+
+## Instructions
+
+In this exercise, you are playing a number guessing game with a friend. The rules are simple: you secretly choose a number between `1` and `100` and your friend tries to guess what number you've chosen. To help your friend, you respond differently depending on how close the guess was to the number you've chosen (`42`). These are the rules for the different replies:
+
+- If the guess is `42`: "Correct"
+- If the guess is `41` or `43`: "So close"
+- If the guess is less than `41`: "Too low"
+- If the guess is greater than `43`: "Too high"
+
+You have four tasks to encode the replies to the guesses.
+
+## 1. Reply to a correct guess
+
+Implement the `reply` function to reply to a correct guess:
+
+```gleam
+reply(42)
+// -> "Correct"
+```
+
+## 2. Reply to a close guess
+
+Modify the `reply` function to reply to close guesses:
+
+```gleam
+reply(41)
+// -> "So close"
+```
+
+## 3. Reply to too low guesses
+
+Modify the `reply` function to reply to too low guesses:
+
+```gleam
+reply(25)
+// -> "Too low"
+```
+
+## 4. Reply to too high guesses
+
+Modify the `reply` function to reply to too high guesses:
+
+```gleam
+reply(88)
+// -> "Too high"
+```
+
+## Source
+
+### Created by
+
+- @lpil

guessing-game/gleam.toml

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+name = "guessing_game"
+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"

guessing-game/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" }

guessing-game/src/guessing_game.gleam

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+pub fn reply(guess: Int) -> String {
+  case guess {
+    n if n < 41 -> "Too low"
+    41 | 43 -> "So close"
+    n if n > 43 -> "Too high"
+    _ -> "Correct"
+  }
+}

guessing-game/test/guessing_game_test.gleam

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+import exercism/should
+import exercism/test_runner
+import guessing_game
+
+pub fn main() {
+  test_runner.main()
+}
+
+pub fn reply_42_test() {
+  guessing_game.reply(42)
+  |> should.equal("Correct")
+}
+
+pub fn reply_41_test() {
+  guessing_game.reply(41)
+  |> should.equal("So close")
+}
+
+pub fn reply_43_test() {
+  guessing_game.reply(43)
+  |> should.equal("So close")
+}
+
+pub fn reply_40_test() {
+  guessing_game.reply(40)
+  |> should.equal("Too low")
+}
+
+pub fn reply_1_test() {
+  guessing_game.reply(1)
+  |> should.equal("Too low")
+}
+
+pub fn reply_44_test() {
+  guessing_game.reply(44)
+  |> should.equal("Too high")
+}
+
+pub fn reply_100_test() {
+  guessing_game.reply(100)
+  |> should.equal("Too high")
+}