[gleam] complete robot-simulator

gleam/robot-simulator/.gitignore

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

gleam/robot-simulator/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/robot_simulator.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.

gleam/robot-simulator/README.md

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+# Robot Simulator
+
+Welcome to Robot Simulator on Exercism's Gleam Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Write a robot simulator.
+
+A robot factory's test facility needs a program to verify robot movements.
+
+The robots have three possible movements:
+
+- turn right
+- turn left
+- advance
+
+Robots are placed on a hypothetical infinite grid, facing a particular direction (north, east, south, or west) at a set of {x,y} coordinates,
+e.g., {3,8}, with coordinates increasing to the north and east.
+
+The robot then receives a number of instructions, at which point the testing facility verifies the robot's new position, and in which direction it is pointing.
+
+- The letter-string "RAALAL" means:
+  - Turn right
+  - Advance twice
+  - Turn left
+  - Advance once
+  - Turn left yet again
+- Say a robot starts at {7, 3} facing north.
+  Then running this stream of instructions should leave it at {9, 4} facing west.
+
+## Source
+
+### Created by
+
+- @jiegillet
+
+### Based on
+
+Inspired by an interview question at a famous company.

gleam/robot-simulator/gleam.toml

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+name = "robot_simulator"
+version = "0.1.0"
+
+[dependencies]
+gleam_bitwise = "~> 1.2"
+gleam_otp = "~> 0.7 or ~> 1.0"
+gleam_stdlib = "~> 0.32 or ~> 1.0"
+simplifile = "~> 1.0"
+gleam_erlang = ">= 0.25.0 and < 1.0.0"
+
+[dev-dependencies]
+exercism_test_runner = "~> 1.4"

gleam/robot-simulator/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 = "1.0.1", build_tools = ["gleam"], requirements = [], otp_app = "argv", source = "hex", outer_checksum = "A6E9009E50BBE863EB37D963E4315398D41A3D87D0075480FC244125808F964A" },
+  { name = "exercism_test_runner", version = "1.7.0", 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 = "2FC1BADB19BEC2AE77BFD2D3A606A014C85412A7B874CAFC4BA8CF04B0B257CD" },
+  { name = "gap", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_community_ansi", "gleam_stdlib"], otp_app = "gap", source = "hex", outer_checksum = "2EE1B0A17E85CF73A0C1D29DA315A2699117A8F549C8E8D89FA8261BE41EDEB1" },
+  { name = "glance", version = "0.8.2", build_tools = ["gleam"], requirements = ["gleam_stdlib", "glexer"], otp_app = "glance", source = "hex", outer_checksum = "ACF09457E8B564AD7A0D823DAFDD326F58263C01ACB0D432A9BEFDEDD1DA8E73" },
+  { name = "gleam_bitwise", version = "1.3.1", build_tools = ["gleam"], requirements = [], otp_app = "gleam_bitwise", source = "hex", outer_checksum = "B36E1D3188D7F594C7FD4F43D0D2CE17561DE896202017548578B16FE1FE9EFC" },
+  { name = "gleam_community_ansi", version = "1.4.0", build_tools = ["gleam"], requirements = ["gleam_community_colour", "gleam_stdlib"], otp_app = "gleam_community_ansi", source = "hex", outer_checksum = "FE79E08BF97009729259B6357EC058315B6FBB916FAD1C2FF9355115FEB0D3A4" },
+  { name = "gleam_community_colour", version = "1.3.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_community_colour", source = "hex", outer_checksum = "A49A5E3AE8B637A5ACBA80ECB9B1AFE89FD3D5351FF6410A42B84F666D40D7D5" },
+  { name = "gleam_erlang", version = "0.25.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "054D571A7092D2A9727B3E5D183B7507DAB0DA41556EC9133606F09C15497373" },
+  { name = "gleam_json", version = "1.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib", "thoas"], otp_app = "gleam_json", source = "hex", outer_checksum = "8B197DD5D578EA6AC2C0D4BDC634C71A5BCA8E7DB5F47091C263ECB411A60DF3" },
+  { name = "gleam_otp", version = "0.10.0", build_tools = ["gleam"], requirements = ["gleam_erlang", "gleam_stdlib"], otp_app = "gleam_otp", source = "hex", outer_checksum = "0B04FE915ACECE539B317F9652CAADBBC0F000184D586AAAF2D94C100945D72B" },
+  { name = "gleam_stdlib", version = "0.36.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "C0D14D807FEC6F8A08A7C9EF8DFDE6AE5C10E40E21325B2B29365965D82EB3D4" },
+  { name = "glexer", version = "0.7.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "glexer", source = "hex", outer_checksum = "4484942A465482A0A100936E1E5F12314DB4B5AC0D87575A7B9E9062090B96BE" },
+  { name = "simplifile", version = "1.5.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "simplifile", source = "hex", outer_checksum = "EB9AA8E65E5C1E3E0FDCFC81BC363FD433CB122D7D062750FFDF24DE4AC40116" },
+  { name = "thoas", version = "0.4.1", build_tools = ["rebar3"], requirements = [], otp_app = "thoas", source = "hex", outer_checksum = "4918D50026C073C4AB1388437132C77A6F6F7C8AC43C60C13758CC0ADCE2134E" },
+]
+
+[requirements]
+exercism_test_runner = { version = "~> 1.4" }
+gleam_bitwise = { version = "~> 1.2" }
+gleam_erlang = { version = ">= 0.25.0 and < 1.0.0"}
+gleam_otp = { version = "~> 0.7 or ~> 1.0" }
+gleam_stdlib = { version = "~> 0.32 or ~> 1.0" }
+simplifile = { version = "~> 1.0" }

gleam/robot-simulator/src/robot_simulator.gleam

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+import gleam/list
+import gleam/string
+
+pub type Robot {
+  Robot(direction: Direction, position: Position)
+}
+
+pub type Direction {
+  North
+  East
+  South
+  West
+}
+
+pub type Position {
+  Position(x: Int, y: Int)
+}
+
+pub fn create(direction: Direction, position: Position) -> Robot {
+  Robot(direction, position)
+}
+
+pub fn move(
+  direction: Direction,
+  position: Position,
+  instructions: String,
+) -> Robot {
+  list.fold(
+    string.to_graphemes(instructions),
+    create(direction, position),
+    exec,
+  )
+}
+
+fn exec(robot, cmd) {
+  case cmd {
+    "A" -> advance(robot)
+    "L" -> turn_left(robot)
+    "R" -> turn_right(robot)
+    _ -> panic as "invalid command"
+  }
+}
+
+fn advance(robot: Robot) {
+  case robot.direction {
+    North ->
+      create(robot.direction, Position(robot.position.x, robot.position.y + 1))
+    East ->
+      create(robot.direction, Position(robot.position.x + 1, robot.position.y))
+    South ->
+      create(robot.direction, Position(robot.position.x, robot.position.y - 1))
+    West ->
+      create(robot.direction, Position(robot.position.x - 1, robot.position.y))
+  }
+}
+
+fn turn_left(robot: Robot) {
+  case robot.direction {
+    North -> create(West, robot.position)
+    East -> create(North, robot.position)
+    South -> create(East, robot.position)
+    West -> create(South, robot.position)
+  }
+}
+
+fn turn_right(robot: Robot) {
+  case robot.direction {
+    North -> create(East, robot.position)
+    East -> create(South, robot.position)
+    South -> create(West, robot.position)
+    West -> create(North, robot.position)
+  }
+}

gleam/robot-simulator/test/robot_simulator_test.gleam

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+import exercism/should
+import exercism/test_runner
+import robot_simulator.{East, North, Position, Robot, South, West}
+
+pub fn main() {
+  test_runner.main()
+}
+
+pub fn create_robot_at_origin_facing_north_test() {
+  robot_simulator.create(North, Position(x: 0, y: 0))
+  |> should.equal(Robot(North, Position(x: 0, y: 0)))
+}
+
+pub fn create_robot_at_negative_position_facing_south_test() {
+  robot_simulator.create(South, Position(x: -1, y: -1))
+  |> should.equal(Robot(South, Position(x: -1, y: -1)))
+}
+
+pub fn rotating_clockwise_changes_north_to_east_test() {
+  robot_simulator.move(North, Position(x: 0, y: 0), "R")
+  |> should.equal(Robot(East, Position(x: 0, y: 0)))
+}
+
+pub fn rotating_clockwise_changes_east_to_south_test() {
+  robot_simulator.move(East, Position(x: 0, y: 0), "R")
+  |> should.equal(Robot(South, Position(x: 0, y: 0)))
+}
+
+pub fn rotating_clockwise_changes_south_to_west_test() {
+  robot_simulator.move(South, Position(x: 0, y: 0), "R")
+  |> should.equal(Robot(West, Position(x: 0, y: 0)))
+}
+
+pub fn rotating_clockwise_changes_west_to_north_test() {
+  robot_simulator.move(West, Position(x: 0, y: 0), "R")
+  |> should.equal(Robot(North, Position(x: 0, y: 0)))
+}
+
+pub fn rotating_counter_clockwise_changes_north_to_west_test() {
+  robot_simulator.move(North, Position(x: 0, y: 0), "L")
+  |> should.equal(Robot(West, Position(x: 0, y: 0)))
+}
+
+pub fn rotating_counter_clockwise_changes_west_to_south_test() {
+  robot_simulator.move(West, Position(x: 0, y: 0), "L")
+  |> should.equal(Robot(South, Position(x: 0, y: 0)))
+}
+
+pub fn rotating_counter_clockwise_changes_south_to_east_test() {
+  robot_simulator.move(South, Position(x: 0, y: 0), "L")
+  |> should.equal(Robot(East, Position(x: 0, y: 0)))
+}
+
+pub fn rotating_counter_clockwise_changes_east_to_north_test() {
+  robot_simulator.move(East, Position(x: 0, y: 0), "L")
+  |> should.equal(Robot(North, Position(x: 0, y: 0)))
+}
+
+pub fn moving_forward_one_facing_north_increments_y_test() {
+  robot_simulator.move(North, Position(x: 0, y: 0), "A")
+  |> should.equal(Robot(North, Position(x: 0, y: 1)))
+}
+
+pub fn moving_forward_one_facing_south_decrements_y_test() {
+  robot_simulator.move(South, Position(x: 0, y: 0), "A")
+  |> should.equal(Robot(South, Position(x: 0, y: -1)))
+}
+
+pub fn moving_forward_one_facing_east_increments_x_test() {
+  robot_simulator.move(East, Position(x: 0, y: 0), "A")
+  |> should.equal(Robot(East, Position(x: 1, y: 0)))
+}
+
+pub fn moving_forward_one_facing_west_decrements_x_test() {
+  robot_simulator.move(West, Position(x: 0, y: 0), "A")
+  |> should.equal(Robot(West, Position(x: -1, y: 0)))
+}
+
+pub fn follow_series_of_instructions_moving_east_and_north_from_readme_test() {
+  robot_simulator.move(North, Position(x: 7, y: 3), "RAALAL")
+  |> should.equal(Robot(West, Position(x: 9, y: 4)))
+}
+
+pub fn follow_series_of_instructions_moving_west_and_north_test() {
+  robot_simulator.move(North, Position(x: 0, y: 0), "LAAARALA")
+  |> should.equal(Robot(West, Position(x: -4, y: 1)))
+}
+
+pub fn follow_series_of_instructions_moving_west_and_south_test() {
+  robot_simulator.move(East, Position(x: 2, y: -7), "RRAAAAALA")
+  |> should.equal(Robot(South, Position(x: -3, y: -8)))
+}
+
+pub fn follow_series_of_instructions_moving_east_and_north_test() {
+  robot_simulator.move(South, Position(x: 8, y: 4), "LAAARRRALLLL")
+  |> should.equal(Robot(North, Position(x: 11, y: 5)))
+}