secrets

secrets/.exercism/config.json

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+{
+  "authors": [
+    "lpil"
+  ],
+  "files": {
+    "solution": [
+      "src/secrets.gleam"
+    ],
+    "test": [
+      "test/secrets_test.gleam"
+    ],
+    "exemplar": [
+      ".meta/example.gleam"
+    ],
+    "invalidator": [
+      "gleam.toml",
+      "manifest.toml"
+    ]
+  },
+  "forked_from": [
+    "elixir/secrets"
+  ],
+  "blurb": "Learn about anonymous functions by writing the software for an encryption device."
+}

secrets/.exercism/metadata.json

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+{"track":"gleam","exercise":"secrets","id":"78c062ca9cf549bea291e52f89974933","url":"https://exercism.org/tracks/gleam/exercises/secrets","handle":"fw353qwgs","is_requester":true,"auto_approve":false}

secrets/.gitignore

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

secrets/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/secrets.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.

secrets/HINTS.md

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+# Hints
+
+## General
+
+- Make use of anonymous functions.
+- Anonymous functions can reference variables in scope when they were defined.
+
+## 1. Create an adder
+
+- Return an anonymous function which adds the argument from the anonymous function to the argument passed in to `secret_add`.
+
+## 2. Create a subtractor
+
+- Return an anonymous function which subtracts the argument passed in to `secret_subtract` from the argument from the anonymous function.
+
+## 3. Create a multiplier
+
+- Return an anonymous function which multiplies the argument from the anonymous function to the argument passed in to `secret_multiply`.
+
+## 4. Create a divider
+
+- Return an anonymous function which divides the argument from the anonymous function by the argument passed in to `secret_divide`.
+
+## 5. Create a function combiner
+
+- Return an anonymous function which each of the functions passed in to `secret_combine`.

secrets/README.md

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+# Secrets
+
+Welcome to Secrets 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
+
+## Anonymous Functions
+
+Gleam has first class functions, meaning functions are normal values that can be assigned to variables, passed as arguments, and returned from other functions.
+
+A named function defined in a module can be referenced by its name.
+
+```gleam
+pub fn main() {
+  // Assign the function to a variable
+  let f = add_one
+  
+  // Invoke the function
+  f(1) // -> 2
+  f(2) // -> 3
+}
+
+fn add_one(x) {
+  x + 1
+}
+```
+
+Gleam also has anonymous functions, which are defined within other functions.
+
+```gleam
+// Define the function
+let f = fn(x) { x + 1 }
+
+// Invoke the function
+f(1) // -> 2
+f(2) // -> 3
+```
+
+The type of a function is written using a similar syntax to anonymous functions. The type of a function that takes an `Int` and a `Float` and returns an `Int` is written like this:
+
+```gleam
+fn(Int, Float) -> Int
+```
+
+Anonymous functions can reference variables that were in scope when they were defined, making them _closures_.
+
+```gleam
+let secret_number = 42
+
+// This function always returns 42
+fn() { secret_number }
+```
+
+The _function capture_ syntax provides a convenient shorthand for creating anonymous functions that pass a single argument to a function. These two expressions are equivalent:
+
+```gleam
+// Anonymous function syntax
+let f = fn(x) { my_function(1, 2, x) }
+
+// Function capture syntax
+let f = my_function(1, 2, _)
+```
+
+## Instructions
+
+In this exercise, you've been tasked with writing the software for an encryption device that works by performing transformations on data. You need a way to flexibly create complicated functions by combining simpler functions together.
+
+For each task, return an anonymous function that can be invoked from the calling scope.
+
+## 1. Create an adder
+
+Implement `secret_add`. It should return a function which takes one argument and adds to it the argument passed in to `secret_add`.
+
+```gleam
+let adder = secret_add(2)
+adder(2)
+// -> 4
+```
+
+## 2. Create a subtractor
+
+Implement `secret_subtract`. It should return a function which takes one argument and subtracts the secret passed in to `secret_subtract` from that argument.
+
+```gleam
+let subtractor = secret_subtract(2)
+subtractor(3)
+// -> 1
+```
+
+## 3. Create a multiplier
+
+Implement `secret_multiply`. It should return a function which takes one argument and multiplies it by the secret passed in to `secret_multiply`.
+
+```gleam
+let multiplier = secret_multiply(7)
+multiplier(3)
+// -> 21
+```
+
+## 4. Create a divider
+
+Implement `secret_divide`. It should return a function which takes one argument and divides it by the secret passed in to `secret_divide`.
+
+```gleam
+let divider = secret_divide(3)
+divider(32)
+// -> 10
+```
+
+## 5. Create a function combiner
+
+Implement `secret_combine`. It should return a function which takes one argument and applies to it the two functions passed in to `secret_combine` in order.
+
+```gleam
+let multiply = secret_multiply(7)
+let divide = secret_divide(3)
+let combined = secret_combine(multiply, divide)
+
+combined(6)
+// -> 14
+```
+
+## Source
+
+### Created by
+
+- @lpil

secrets/gleam.toml

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+name = "secrets"
+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"

secrets/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" }

secrets/src/secrets.gleam

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+pub fn secret_add(secret: Int) -> fn(Int) -> Int {
+  fn(n: Int) { n + secret }
+}
+
+pub fn secret_subtract(secret: Int) -> fn(Int) -> Int {
+  fn(n: Int) { n - secret }
+}
+
+pub fn secret_multiply(secret: Int) -> fn(Int) -> Int {
+  fn(n: Int) { n * secret }
+}
+
+pub fn secret_divide(secret: Int) -> fn(Int) -> Int {
+  fn(n: Int) { n / secret }
+}
+
+pub fn secret_combine(
+  secret_function1: fn(Int) -> Int,
+  secret_function2: fn(Int) -> Int,
+) -> fn(Int) -> Int {
+  fn(n: Int) { secret_function2(secret_function1(n)) }
+}

secrets/test/secrets_test.gleam

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+import exercism/should
+import exercism/test_runner
+import secrets
+
+pub fn main() {
+  test_runner.main()
+}
+
+pub fn add_3_test() {
+  let add = secrets.secret_add(3)
+  should.equal(6, add(3))
+}
+
+pub fn add_6_test() {
+  let add = secrets.secret_add(6)
+  should.equal(15, add(9))
+}
+
+pub fn subtract_3_test() {
+  let subtract = secrets.secret_subtract(3)
+  should.equal(3, subtract(6))
+}
+
+pub fn subtract_6_test() {
+  let subtract = secrets.secret_subtract(6)
+  should.equal(-3, subtract(3))
+}
+
+pub fn multiply_by_3_test() {
+  let multiply = secrets.secret_multiply(3)
+  should.equal(18, multiply(6))
+}
+
+pub fn multiply_by_6_test() {
+  let multiply = secrets.secret_multiply(6)
+  should.equal(42, multiply(7))
+}
+
+pub fn divide_by_3_test() {
+  let divide = secrets.secret_divide(3)
+  should.equal(2, divide(6))
+}
+
+pub fn divide_by_6_test() {
+  let divide = secrets.secret_divide(6)
+  should.equal(1, divide(7))
+}
+
+pub fn combine_5_add_10_then_subtract_5_test() {
+  let f = secrets.secret_add(10)
+  let g = secrets.secret_subtract(5)
+  let h = secrets.secret_combine(f, g)
+
+  should.equal(10, h(5))
+}
+
+pub fn combine_100_multiply_by_2_then_subtract_20_test() {
+  let f = secrets.secret_multiply(2)
+  let g = secrets.secret_subtract(20)
+  let h = secrets.secret_combine(f, g)
+
+  should.equal(180, h(100))
+}
+
+pub fn combine_100_divide_by_10_then_add_10_test() {
+  let f = secrets.secret_divide(10)
+  let g = secrets.secret_add(10)
+  let h = secrets.secret_combine(f, g)
+
+  should.equal(20, h(100))
+}
+
+pub fn combine_32_divide_by_3_then_add_5_test() {
+  let f = secrets.secret_divide(3)
+  let g = secrets.secret_add(5)
+  let h = secrets.secret_combine(f, g)
+
+  should.equal(15, h(32))
+}
+
+pub fn combine_7_multiply_3_then_add_5_test() {
+  let f = secrets.secret_multiply(3)
+  let g = secrets.secret_add(5)
+  let h = secrets.secret_combine(f, g)
+
+  should.equal(26, h(7))
+}
+
+pub fn combine_7_multiply_7_then_multiply_7_test() {
+  let f = secrets.secret_multiply(7)
+  let g = secrets.secret_multiply(7)
+  let h = secrets.secret_combine(f, g)
+
+  should.equal(343, h(7))
+}
+
+pub fn combine_4_divide_1_then_divide_2_test() {
+  let f = secrets.secret_divide(1)
+  let g = secrets.secret_divide(2)
+  let h = secrets.secret_combine(f, g)
+
+  should.equal(2, h(4))
+}
+
+pub fn combine_7_divide_7_then_divide_7_test() {
+  let f = secrets.secret_divide(7)
+  let g = secrets.secret_divide(7)
+  let h = secrets.secret_combine(f, g)
+
+  should.equal(0, h(7))
+}
+
+pub fn combine_4_add_3_then_divide_7_test() {
+  let f = secrets.secret_add(3)
+  let g = secrets.secret_divide(7)
+  let h = secrets.secret_combine(f, g)
+
+  should.equal(1, h(4))
+}
+
+pub fn combine_81_divide_by_9_then_multiply_7_test() {
+  let f = secrets.secret_divide(9)
+  let g = secrets.secret_multiply(7)
+  let h = secrets.secret_combine(f, g)
+
+  should.equal(63, h(81))
+}