diff --git a/config.json b/config.json index 32448b50..ed7073a7 100644 --- a/config.json +++ b/config.json @@ -979,6 +979,14 @@ "events", "reactive_programming" ] + }, + { + "slug": "robot-simulator", + "name": "Robot Simulator", + "uuid": "cfedbb93-eda4-49f9-92a1-aa1a6cc8453f", + "practices": [], + "prerequisites": [], + "difficulty": 1 } ] }, diff --git a/exercises/practice/robot-simulator/.docs/instructions.md b/exercises/practice/robot-simulator/.docs/instructions.md new file mode 100644 index 00000000..0ac96ce0 --- /dev/null +++ b/exercises/practice/robot-simulator/.docs/instructions.md @@ -0,0 +1,25 @@ +# 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. diff --git a/exercises/practice/robot-simulator/.meta/config.json b/exercises/practice/robot-simulator/.meta/config.json new file mode 100644 index 00000000..9dde3511 --- /dev/null +++ b/exercises/practice/robot-simulator/.meta/config.json @@ -0,0 +1,21 @@ +{ + "authors": [ + "ilmanzo" + ], + "contributors": [ + "ee7" + ], + "files": { + "solution": [ + "robot_simulator.nim" + ], + "test": [ + "test_robot_simulator.nim" + ], + "example": [ + ".meta/example.nim" + ] + }, + "blurb": "Write a robot simulator.", + "source": "Inspired by an interview question at a famous company." +} diff --git a/exercises/practice/robot-simulator/.meta/example.nim b/exercises/practice/robot-simulator/.meta/example.nim new file mode 100644 index 00000000..d230dab3 --- /dev/null +++ b/exercises/practice/robot-simulator/.meta/example.nim @@ -0,0 +1,29 @@ +type + Compass* = enum + North, East, South, West + + Robot* = object + direction*: Compass + x*: int + y*: int + +func initRobot*(facing = North, x = 0, y = 0): Robot = + Robot(direction: facing, x: x, y: y) + +func move*(robot: var Robot, instructions: string) = + for c in instructions: + case c + of 'L': + robot.direction = + if robot.direction == Compass.low: Compass.high else: pred(robot.direction) + of 'R': + robot.direction = + if robot.direction == Compass.high: Compass.low else: succ(robot.direction) + of 'A': + case robot.direction: + of North: inc robot.y + of South: dec robot.y + of East: inc robot.x + of West: dec robot.x + else: + discard diff --git a/exercises/practice/robot-simulator/.meta/tests.toml b/exercises/practice/robot-simulator/.meta/tests.toml new file mode 100644 index 00000000..16da03d4 --- /dev/null +++ b/exercises/practice/robot-simulator/.meta/tests.toml @@ -0,0 +1,64 @@ +# This is an auto-generated file. +# +# Regenerating this file via `configlet sync` will: +# - Recreate every `description` key/value pair +# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications +# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion) +# - Preserve any other key/value pair +# +# As user-added comments (using the # character) will be removed when this file +# is regenerated, comments can be added via a `comment` key. + +[c557c16d-26c1-4e06-827c-f6602cd0785c] +description = "Create robot -> at origin facing north" + +[bf0dffce-f11c-4cdb-8a5e-2c89d8a5a67d] +description = "Create robot -> at negative position facing south" + +[8cbd0086-6392-4680-b9b9-73cf491e67e5] +description = "Rotating clockwise -> changes north to east" + +[8abc87fc-eab2-4276-93b7-9c009e866ba1] +description = "Rotating clockwise -> changes east to south" + +[3cfe1b85-bbf2-4bae-b54d-d73e7e93617a] +description = "Rotating clockwise -> changes south to west" + +[5ea9fb99-3f2c-47bd-86f7-46b7d8c3c716] +description = "Rotating clockwise -> changes west to north" + +[fa0c40f5-6ba3-443d-a4b3-58cbd6cb8d63] +description = "Rotating counter-clockwise -> changes north to west" + +[da33d734-831f-445c-9907-d66d7d2a92e2] +description = "Rotating counter-clockwise -> changes west to south" + +[bd1ca4b9-4548-45f4-b32e-900fc7c19389] +description = "Rotating counter-clockwise -> changes south to east" + +[2de27b67-a25c-4b59-9883-bc03b1b55bba] +description = "Rotating counter-clockwise -> changes east to north" + +[f0dc2388-cddc-4f83-9bed-bcf46b8fc7b8] +description = "Moving forward one -> facing north increments Y" + +[2786cf80-5bbf-44b0-9503-a89a9c5789da] +description = "Moving forward one -> facing south decrements Y" + +[84bf3c8c-241f-434d-883d-69817dbd6a48] +description = "Moving forward one -> facing east increments X" + +[bb69c4a7-3bbf-4f64-b415-666fa72d7b04] +description = "Moving forward one -> facing west decrements X" + +[e34ac672-4ed4-4be3-a0b8-d9af259cbaa1] +description = "Follow series of instructions -> moving east and north from README" + +[f30e4955-4b47-4aa3-8b39-ae98cfbd515b] +description = "Follow series of instructions -> moving west and north" + +[3e466bf6-20ab-4d79-8b51-264165182fca] +description = "Follow series of instructions -> moving west and south" + +[41f0bb96-c617-4e6b-acff-a4b279d44514] +description = "Follow series of instructions -> moving east and north" diff --git a/exercises/practice/robot-simulator/robot_simulator.nim b/exercises/practice/robot-simulator/robot_simulator.nim new file mode 100644 index 00000000..9e4f829c --- /dev/null +++ b/exercises/practice/robot-simulator/robot_simulator.nim @@ -0,0 +1,14 @@ +type + Compass* = enum + North, East, South, West + + Robot* = object + direction*: Compass + x*: int + y*: int + +proc initRobot*(facing = North, x = 0, y = 0): Robot = + discard + +proc move*(robot: var Robot, instructions: string) = + discard diff --git a/exercises/practice/robot-simulator/test_robot_simulator.nim b/exercises/practice/robot-simulator/test_robot_simulator.nim new file mode 100644 index 00000000..84b3e45b --- /dev/null +++ b/exercises/practice/robot-simulator/test_robot_simulator.nim @@ -0,0 +1,125 @@ +import unittest +import robot_simulator + +suite "Robot Simulator": + test "create robot: at origin facing north": + var robot = initRobot() + check robot.direction == North + + test "create robot: at negative position facing south": + var robot = initRobot(South, -1, -1) + check robot.direction == South + check robot.x == -1 + check robot.y == -1 + + test "rotating clockwise: changes north to east": + var robot = initRobot() + robot.move("R") + check robot.direction == East + check robot.x == 0 + check robot.y == 0 + + test "rotating clockwise: changes east to south": + var robot = initRobot(East) + robot.move("R") + check robot.direction == South + check robot.x == 0 + check robot.y == 0 + + test "rotating clockwise: changes south to west": + var robot = initRobot(South) + robot.move("R") + check robot.direction == West + check robot.x == 0 + check robot.y == 0 + + test "rotating clockwise: changes west to north": + var robot = initRobot(West) + robot.move("R") + check robot.direction == North + check robot.x == 0 + check robot.y == 0 + + test "rotating counter-clockwise: changes north to west": + var robot = initRobot() + robot.move("L") + check robot.direction == West + check robot.x == 0 + check robot.y == 0 + + test "rotating counter-clockwise: changes west to south": + var robot = initRobot(West) + robot.move("L") + check robot.direction == South + check robot.x == 0 + check robot.y == 0 + + test "rotating counter-clockwise: changes south to east": + var robot = initRobot(South) + robot.move("L") + check robot.direction == East + check robot.x == 0 + check robot.y == 0 + + test "rotating counter-clockwise: changes east to north": + var robot = initRobot(East) + robot.move("L") + check robot.direction == North + check robot.x == 0 + check robot.y == 0 + + test "moving forward one: facing north increments Y": + var robot = initRobot() + robot.move("A") + check robot.direction == North + check robot.x == 0 + check robot.y == 1 + + test "moving forward one: facing south decrements Y": + var robot = initRobot(South) + robot.move("A") + check robot.direction == South + check robot.x == 0 + check robot.y == -1 + + test "moving forward one: facing east increments X": + var robot = initRobot(East) + robot.move("A") + check robot.direction == East + check robot.x == 1 + check robot.y == 0 + + test "moving forward one: facing west decrements X": + var robot = initRobot(West) + robot.move("A") + check robot.direction == West + check robot.x == -1 + check robot.y == 0 + + test "Follow series of instructions: moving east and north from README": + var robot = initRobot(North, 7, 3) + robot.move("RAALAL") + check robot.direction == West + check robot.x == 9 + check robot.y == 4 + + test "Follow series of instructions: moving west and north": + var robot = initRobot() + robot.move("LAAARALA") + check robot.direction == West + check robot.x == -4 + check robot.y == 1 + + test "Follow series of instructions: moving west and south": + var robot = initRobot(East, 2, -7) + robot.move("RRAAAAALA") + check robot.direction == South + check robot.x == -3 + check robot.y == -8 + + test "Follow series of instructions: moving east and north": + var robot = initRobot(South, 8, 4) + robot.move("LAAARRRALLLL") + check robot.direction == North + check robot.x == 11 + check robot.y == 5