Add matrix

config.json

@@ -229,6 +229,14 @@
         "prerequisites": [],
         "difficulty": 2
       },
+      {
+        "slug": "matrix",
+        "name": "Matrix",
+        "uuid": "1de866bf-2b12-4f4e-906d-03d5783e8cb8",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
+      },
       {
         "slug": "nucleotide-count",
         "name": "Nucleotide Count",

exercises/practice/matrix/.docs/instructions.md

@@ -0,0 +1,38 @@
+# Instructions
+
+Given a string representing a matrix of numbers, return the rows and columns of that matrix.
+
+So given a string with embedded newlines like:
+
+```text
+9 8 7
+5 3 2
+6 6 7
+```
+
+representing this matrix:
+
+```text
+    1  2  3
+  |---------
+1 | 9  8  7
+2 | 5  3  2
+3 | 6  6  7
+```
+
+your code should be able to spit out:
+
+- A list of the rows, reading each row left-to-right while moving top-to-bottom across the rows,
+- A list of the columns, reading each column top-to-bottom while moving from left-to-right.
+
+The rows for our example matrix:
+
+- 9, 8, 7
+- 5, 3, 2
+- 6, 6, 7
+
+And its columns:
+
+- 9, 5, 6
+- 8, 3, 6
+- 7, 2, 7

exercises/practice/matrix/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "BNAndras"
+  ],
+  "files": {
+    "solution": [
+      "src/matrix.art"
+    ],
+    "test": [
+      "tests/test-matrix.art"
+    ],
+    "example": [
+      ".meta/src/example.art"
+    ]
+  },
+  "blurb": "Given a string representing a matrix of numbers, return the rows and columns of that matrix.",
+  "source": "Exercise by the JumpstartLab team for students at The Turing School of Software and Design.",
+  "source_url": "https://turing.edu"
+}

exercises/practice/matrix/.meta/src/example.art

@@ -0,0 +1,12 @@
+row: function [matrix position][
+    lines: split.lines matrix
+    map split.words lines\[dec position] 'elt -> to :integer elt
+]
+
+column: function [matrix position][
+    lines: split.lines matrix
+    map lines 'line [
+        nums: to [:integer] split.words line
+        nums\[dec position]
+    ]   
+]

exercises/practice/matrix/.meta/tests.toml

@@ -0,0 +1,34 @@
+# 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.
+
+[ca733dab-9d85-4065-9ef6-a880a951dafd]
+description = "extract row from one number matrix"
+
+[5c93ec93-80e1-4268-9fc2-63bc7d23385c]
+description = "can extract row"
+
+[2f1aad89-ad0f-4bd2-9919-99a8bff0305a]
+description = "extract row where numbers have different widths"
+
+[68f7f6ba-57e2-4e87-82d0-ad09889b5204]
+description = "can extract row from non-square matrix with no corresponding column"
+
+[e8c74391-c93b-4aed-8bfe-f3c9beb89ebb]
+description = "extract column from one number matrix"
+
+[7136bdbd-b3dc-48c4-a10c-8230976d3727]
+description = "can extract column"
+
+[ad64f8d7-bba6-4182-8adf-0c14de3d0eca]
+description = "can extract column from non-square matrix with no corresponding row"
+
+[9eddfa5c-8474-440e-ae0a-f018c2a0dd89]
+description = "extract column where numbers have different widths"

exercises/practice/matrix/src/matrix.art

@@ -0,0 +1,7 @@
+row: function [matrix position][
+    panic "Please implement the row function"
+]
+
+column: function [matrix position][
+    panic "Please implement the column function"
+]

exercises/practice/matrix/tester.art

@@ -0,0 +1,3 @@
+import {unitt}!
+
+runTests.failFast findTests "tests"

exercises/practice/matrix/tests/test-matrix.art

@@ -0,0 +1,95 @@
+import {unitt}!
+import {src/matrix}!
+
+suite "Matrix" [
+    suite "row" [
+        test "extract row fron one number matrix" [
+            string: "1"
+            position: 1
+            result: row string position
+            expected: [1]
+            assert -> expected = result
+        ]
+
+        test.skip "can extract row" [
+            matrix: join.with:"\n" [
+                "1 2"
+                "3 4"
+            ]
+            position: 2
+            result: row matrix position
+            expected: [3 4]
+            assert -> expected = result
+        ]
+
+        test.skip "extract row where numbers have different widths" [
+            matrix: join.with:"\n" [
+                "1 2"
+                "10 20"
+            ]
+            position: 2
+            result: row matrix position
+            expected: [10 20]
+            assert -> expected = result
+        ]
+
+        test.skip "can extract row from non-square matrix with no corresponding column" [
+            matrix: join.with:"\n" [
+                "1 2 3"
+                "4 5 6"
+                "7 8 9"
+                "8 7 6"
+            ]
+            position: 4
+            result: row matrix position
+            expected: [8 7 6]
+            assert -> expected = result
+        ]
+    ]
+
+    suite "column" [
+        test.skip "extract column from one number matrix" [
+            string: "1"
+            position: 1
+            result: column string position
+            expected: [1]
+            assert -> expected = result
+        ]
+
+        test.skip "can extract column" [
+            matrix: join.with:"\n" [
+                "1 2 3"
+                "4 5 6"
+                "7 8 9"
+            ]
+            position: 3
+            result: column matrix position
+            expected: [3 6 9]
+            assert -> expected = result
+        ]
+
+        test.skip "can extract column from non-square matrix with no corresponding row" [
+            matrix: join.with:"\n" [
+                "1 2 3 4"
+                "5 6 7 8"
+                "9 8 7 6"
+            ]
+            position: 4
+            result: column matrix position
+            expected: [4 8 6]
+            assert -> expected = result
+        ]
+
+        test.skip "extract column where numbers have different widths" [
+            matrix: join.with:"\n" [
+                "89 1903 3"
+                "18 3 1"
+                "9 4 800"
+            ]
+            position: 2
+            result: column matrix position
+            expected: [1903 3 4]
+            assert -> expected = result
+        ]
+    ]
+]