bettys-bike-shop

bettys-bike-shop/.exercism/config.json

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+{
+  "authors": [
+    "lpil"
+  ],
+  "files": {
+    "solution": [
+      "src/bettys_bike_shop.gleam"
+    ],
+    "test": [
+      "test/bettys_bike_shop_test.gleam"
+    ],
+    "exemplar": [
+      ".meta/example.gleam"
+    ],
+    "invalidator": [
+      "gleam.toml",
+      "manifest.toml"
+    ]
+  },
+  "blurb": "Learn about modules by helping Betty to display her bikes prices."
+}

bettys-bike-shop/.exercism/metadata.json

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+{"track":"gleam","exercise":"bettys-bike-shop","id":"45556bba3539448d9a731d74deeee93a","url":"https://exercism.org/tracks/gleam/exercises/bettys-bike-shop","handle":"fw353qwgs","is_requester":true,"auto_approve":false}

bettys-bike-shop/.gitignore

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

bettys-bike-shop/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/bettys_bike_shop.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.

bettys-bike-shop/HINTS.md

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+# Hints
+
+## General
+
+- Int and float operators are described in [the language tour][tour].
+- Functions for working with ints are defined in the [`gleam/int` module][int].
+- Functions for working with floats are defined in the [`gleam/float` module][float].
+- Functions for working with strings are defined in the [`gleam/string` module][string].
+
+[tour]: https://gleam.run/book/tour/ints-and-floats.html
+[int]: https://hexdocs.pm/gleam_stdlib/gleam/int.html
+[float]: https://hexdocs.pm/gleam_stdlib/gleam/float.html
+[string]: https://hexdocs.pm/gleam_stdlib/gleam/string.html

bettys-bike-shop/README.md

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+# Betty's Bike Shop
+
+Welcome to Betty's Bike Shop 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
+
+## Ints
+
+There are two different kinds of numbers in Gleam - ints and floats.
+
+Ints are whole numbers.
+
+```gleam
+let integer = 3
+// -> 3
+```
+
+Gleam has several operators that work with ints.
+
+```gleam
+1 + 1 // -> 2
+5 - 1 // -> 4
+5 / 2 // -> 2
+3 * 3 // -> 9
+5 % 2 // -> 1
+
+2 > 1  // -> True
+2 < 1  // -> False
+2 >= 1 // -> True
+2 <= 1 // -> False
+```
+
+## Floats
+
+Floats are numbers with one or more digits behind the decimal separator.
+
+```gleam
+let float = 3.45
+// -> 3.45
+```
+
+Floats also have their own set of operators.
+
+```gleam
+1.0 +. 1.4 // -> 2.4
+5.0 -. 1.5 // -> 3.5
+5.0 /. 2.0 // -> 2.5
+3.0 *. 3.1 // -> 9.3
+
+2.0 >. 1.0  // -> True
+2.0 <. 1.0  // -> False
+2.0 >=. 1.0 // -> True
+2.0 <=. 1.0 // -> False
+```
+
+## Modules
+
+### Modules
+
+Gleam code is organised into modules, and each file is one Gleam module.
+
+Up until now we have written functions with the `pub fn` syntax, which defines a function that is publicly available to other modules. Functions defined with `fn` are private to the module they are defined in and cannot be used by other modules.
+
+```gleam
+// This function is public
+pub fn add(x, y) {
+  x + y
+}
+
+// This function is private
+fn subtract(x, y) {
+  x - y
+}
+```
+
+Gleam modules have names, and the name is based on their file path within the `src` or `test` directory.
+
+For example, a module defined in `src\geometry\rectangle.gleam` (on Windows) or `src/geometry/rectangle.gleam` (on UNIX-like operating systems) would be named `geometry/rectangle`.
+
+### Importing functions from other modules
+
+Accessing functions defined in other modules is done via imports.
+All functions within that module that were exposed by it are made accessible when importing that module.
+But how they are accessed varies depending on how the module is imported.
+
+Qualified imports are the default, and accessing a function within such module (for example the `map` function in the `gleam/list` module) is done by prefixing the module name (`list.map`).
+
+```gleam
+// Import the int module
+import gleam/int
+
+pub fn run(x: Int) -> String {
+  // Use the to_string function from the int module
+  int.to_string(x)
+}
+```
+
+By default the name used to refer to the module is the last part of the module name, in this case `int`, but this can be changed by using the `as` keyword.
+
+```gleam
+// Import the int module and refer to it as i
+import gleam/int as i
+
+pub fn run(x: Int) -> String {
+  i.to_string(x)
+}
+```
+
+Unqualified imports enable direct access to the exposed functions within that module, without prefixing.
+
+```gleam
+// Import the to_string function from the int module
+import gleam/int.{to_string}
+
+pub fn run(x: Int) -> String {
+  to_string(x)
+}
+```
+
+Qualified imports are preferred as they make it clearer to the reader where a function comes from, and to avoid name clashes.
+
+
+### Standard library
+
+Gleam has a rich and well-documented standard library. The documentation is available online at [hexdocs.pm/gleam_stdlib][docs]. Save this link somewhere - you will use it a lot!
+
+Most built-in data types have a corresponding module that offers functions for working with that data type, e.g. there's the `gleam/int` module for ints, `gleam/string` module for strings, `gleam/list` module for lists and so on.
+
+[docs]: https://hexdocs.pm/gleam_stdlib/
+
+## Instructions
+
+In this exercise you're going to write some code to help Betty's Bike Shop, an online shop for bikes and parts.
+You have three tasks, aiming at correctly displaying the bikes and parts prices on the website.
+
+## 1. Export the `pence_to_pounds` function
+
+Your colleague has already written the skeleton of the module, the incomplete functions `pence_to_pounds` and `pounds_to_string`.
+However, they have forgotten to export the `pence_to_pounds` function, so it is currently not visible by other modules or by the test suite.
+
+Export the `pence_to_pounds` function.
+
+## 2. Convert pence to pounds
+
+Currently, the price is stored as an integer number of *pence* (the bike shop is based in the UK).
+On the website, we want to show the price in *pounds*, where 1.00 pound amounts to 100 pence.
+Your first task is to implement the `pence_to_pounds` function, taking an `Int` amount of pence, and converting it into its equivalent pounds as a `Float`.
+You should also add type annotations for that function.
+
+```gleam
+pence_to_pounds(106)
+// -> 1.06
+```
+
+## 3. Format the price for display on the website
+
+Since Betty's bikes are sold in pounds, prices should be displayed with the symbol "£".
+Your second task is thus to implement the `pounds_to_string` function, taking an amount of pounds as a `Float` and returning its price displayed as a `String` with the pound symbol prepended.
+
+You should import the `gleam/float` and `gleam/string` modules before using them.
+
+You should also define the type annotation for `pounds_to_string`.
+
+```gleam
+pounds_to_string(1.06)
+// -> "£1.06"
+```
+
+## Source
+
+### Created by
+
+- @lpil

bettys-bike-shop/gleam.toml

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+name = "bettys_bike_shop"
+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"

bettys-bike-shop/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" }

bettys-bike-shop/src/bettys_bike_shop.gleam

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+import gleam/float
+import gleam/int
+import gleam/string
+
+// TODO: import the `gleam/float` module
+// TODO: import the `gleam/string` module
+
+pub fn pence_to_pounds(pence: Int) -> Float {
+  int.to_float(pence) /. 100.0
+}
+
+pub fn pounds_to_string(pounds: Float) -> String {
+  string.append("£", float.to_string(pounds))
+}

bettys-bike-shop/test/bettys_bike_shop_test.gleam

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+import bettys_bike_shop
+import exercism/should
+import exercism/test_runner
+
+pub fn main() {
+  test_runner.main()
+}
+
+pub fn pence_to_pounds_599_is_5_99_pounds_test() {
+  bettys_bike_shop.pence_to_pounds(599)
+  |> should.equal(5.99)
+}
+
+pub fn pence_to_pounds_33_is_0_33_pounds_test() {
+  bettys_bike_shop.pence_to_pounds(33)
+  |> should.equal(0.33)
+}
+
+pub fn pounds_to_string_5_99_test() {
+  bettys_bike_shop.pounds_to_string(5.99)
+  |> should.equal("£5.99")
+}
+
+pub fn pounds_to_string_0_33_test() {
+  bettys_bike_shop.pounds_to_string(0.33)
+  |> should.equal("£0.33")
+}