[gleam] complete flatten-array

gleam/flatten-array/.gitignore

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

gleam/flatten-array/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/flatten_array.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/flatten-array/README.md

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+# Flatten Array
+
+Welcome to Flatten Array on Exercism's Gleam Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Take a nested list and return a single flattened list with all values except nil/null.
+
+The challenge is to write a function that accepts an arbitrarily-deep nested list-like structure and returns a flattened structure without any nil/null values.
+
+For example:
+
+input: [1,[2,3,null,4],[null],5]
+
+output: [1,2,3,4,5]
+
+## Source
+
+### Created by
+
+- @jiegillet
+
+### Based on
+
+Interview Question - https://reference.wolfram.com/language/ref/Flatten.html

gleam/flatten-array/gleam.toml

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+name = "flatten_array"
+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/flatten-array/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/flatten-array/src/flatten_array.gleam

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+import gleam/list
+
+pub type NestedList(a) {
+  Null
+  Value(a)
+  List(List(NestedList(a)))
+}
+
+pub fn flatten(nested_list: NestedList(a)) -> List(a) {
+  case nested_list {
+    Null -> []
+    Value(a) -> [a]
+    List(l) -> list.flat_map(l, flatten)
+  }
+}

gleam/flatten-array/test/flatten_array_test.gleam

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+import exercism/should
+import exercism/test_runner
+import flatten_array.{List, Null, Value}
+
+pub fn main() {
+  test_runner.main()
+}
+
+pub fn empty_test() {
+  flatten_array.flatten(List([]))
+  |> should.equal([])
+}
+
+pub fn no_nesting_test() {
+  flatten_array.flatten(List([Value(0), Value(1), Value(2)]))
+  |> should.equal([0, 1, 2])
+}
+
+pub fn flattens_a_nested_array_test() {
+  flatten_array.flatten(List([List([List([])])]))
+  |> should.equal([])
+}
+
+pub fn flattens_array_with_just_integers_present_test() {
+  flatten_array.flatten(
+    List([
+      Value(1),
+      List([Value(2), Value(3), Value(4), Value(5), Value(6), Value(7)]),
+      Value(8),
+    ]),
+  )
+  |> should.equal([1, 2, 3, 4, 5, 6, 7, 8])
+}
+
+pub fn five_level_nesting_test() {
+  flatten_array.flatten(
+    List([
+      Value(0),
+      Value(2),
+      List([
+        List([Value(2), Value(3)]),
+        Value(8),
+        Value(100),
+        Value(4),
+        List([List([List([Value(50)])])]),
+      ]),
+      Value(-2),
+    ]),
+  )
+  |> should.equal([0, 2, 2, 3, 8, 100, 4, 50, -2])
+}
+
+pub fn six_level_nesting_test() {
+  flatten_array.flatten(
+    List([
+      Value(1),
+      List([
+        Value(2),
+        List([List([Value(3)])]),
+        List([Value(4), List([List([Value(5)])])]),
+        Value(6),
+        Value(7),
+      ]),
+      Value(8),
+    ]),
+  )
+  |> should.equal([1, 2, 3, 4, 5, 6, 7, 8])
+}
+
+pub fn null_values_are_omitted_from_the_final_result_test() {
+  flatten_array.flatten(List([Value(1), Value(2), Null]))
+  |> should.equal([1, 2])
+}
+
+pub fn consecutive_null_values_at_the_front_of_the_list_are_omitted_from_the_final_result_test() {
+  flatten_array.flatten(List([Null, Null, Value(3)]))
+  |> should.equal([3])
+}
+
+pub fn consecutive_null_values_in_the_middle_of_the_list_are_omitted_from_the_final_result_test() {
+  flatten_array.flatten(List([Value(1), Null, Null, Value(4)]))
+  |> should.equal([1, 4])
+}
+
+pub fn six_level_nest_list_with_null_values_test() {
+  flatten_array.flatten(
+    List([
+      Value(0),
+      Value(2),
+      List([
+        List([Value(2), Value(3)]),
+        Value(8),
+        List([List([Value(100)])]),
+        Null,
+        List([List([Null])]),
+      ]),
+      Value(-2),
+    ]),
+  )
+  |> should.equal([0, 2, 2, 3, 8, 100, -2])
+}
+
+pub fn all_values_in_nested_list_are_null_test() {
+  flatten_array.flatten(
+    List([
+      Null,
+      List([List([List([Null])])]),
+      Null,
+      Null,
+      List([List([Null, Null]), Null]),
+      Null,
+    ]),
+  )
+  |> should.equal([])
+}