add transpose

config.json

@@ -800,6 +800,14 @@
         "prerequisites": [],
         "difficulty": 5
       },
+      {
+        "slug": "transpose",
+        "name": "Transpose",
+        "uuid": "c28e01dc-7d5c-4390-bef1-7831e6111b76",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 5
+      },
       {
         "slug": "wordy",
         "name": "Wordy",

exercises/practice/transpose/.docs/instructions.md

@@ -0,0 +1,61 @@
+# Instructions
+
+Given an input text output it transposed.
+
+Roughly explained, the transpose of a matrix:
+
+```text
+ABC
+DEF
+```
+
+is given by:
+
+```text
+AD
+BE
+CF
+```
+
+Rows become columns and columns become rows.
+See [transpose][].
+
+If the input has rows of different lengths, this is to be solved as follows:
+
+- Pad to the left with spaces.
+- Don't pad to the right.
+
+Therefore, transposing this matrix:
+
+```text
+ABC
+DE
+```
+
+results in:
+
+```text
+AD
+BE
+C
+```
+
+And transposing:
+
+```text
+AB
+DEF
+```
+
+results in:
+
+```text
+AD
+BE
+ F
+```
+
+In general, all characters from the input should also be present in the transposed output.
+That means that if a column in the input text contains only spaces on its bottom-most row(s), the corresponding output row should contain the spaces in its right-most column(s).
+
+[transpose]: https://en.wikipedia.org/wiki/Transpose

exercises/practice/transpose/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "BNAndras"
+  ],
+  "files": {
+    "solution": [
+      "transpose.coffee"
+    ],
+    "test": [
+      "transpose.spec.coffee"
+    ],
+    "example": [
+      ".meta/example.coffee"
+    ]
+  },
+  "blurb": "Take input text and output it transposed.",
+  "source": "Reddit r/dailyprogrammer challenge #270 [Easy].",
+  "source_url": "https://web.archive.org/web/20230630051421/https://old.reddit.com/r/dailyprogrammer/comments/4msu2x/challenge_270_easy_transpose_the_input_text/"
+}

exercises/practice/transpose/.meta/example.coffee

@@ -0,0 +1,14 @@
+class Transpose
+  @transpose: (text) ->
+    return '' unless text
+
+    lines = text.split '\n'
+    maxLen = Math.max (line.length for line in lines)...
+    padded = lines.map (line) -> line + '\0'.repeat maxLen - line.length
+
+    result = for i in [0...maxLen]
+      (row[i] for row in padded).join('').replace(/\0+$/, '').replace(/\0/g, ' ')
+
+    result.join '\n'
+
+module.exports = Transpose

exercises/practice/transpose/.meta/tests.toml

@@ -0,0 +1,46 @@
+# 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.
+
+[404b7262-c050-4df0-a2a2-0cb06cd6a821]
+description = "empty string"
+
+[a89ce8a3-c940-4703-a688-3ea39412fbcb]
+description = "two characters in a row"
+
+[855bb6ae-4180-457c-abd0-ce489803ce98]
+description = "two characters in a column"
+
+[5ceda1c0-f940-441c-a244-0ced197769c8]
+description = "simple"
+
+[a54675dd-ae7d-4a58-a9c4-0c20e99a7c1f]
+description = "single line"
+
+[0dc2ec0b-549d-4047-aeeb-8029fec8d5c5]
+description = "first line longer than second line"
+
+[984e2ec3-b3d3-4b53-8bd6-96f5ef404102]
+description = "second line longer than first line"
+
+[eccd3784-45f0-4a3f-865a-360cb323d314]
+description = "mixed line length"
+
+[85b96b3f-d00c-4f80-8ca2-c8a5c9216c2d]
+description = "square"
+
+[b9257625-7a53-4748-8863-e08e9d27071d]
+description = "rectangle"
+
+[b80badc9-057e-4543-bd07-ce1296a1ea2c]
+description = "triangle"
+
+[76acfd50-5596-4d05-89f1-5116328a7dd9]
+description = "jagged triangle"

exercises/practice/transpose/transpose.coffee

@@ -0,0 +1,4 @@
+class Transpose
+  @transpose: (text) ->
+
+module.exports = Transpose

exercises/practice/transpose/transpose.spec.coffee

@@ -0,0 +1,199 @@
+Transpose = require './transpose'
+
+describe 'Transpose', ->
+  it 'empty string', ->
+    lines = ''
+    expected = ''
+    expect(Transpose.transpose lines).toEqual expected
+
+  xit 'two characters in a row', ->
+    lines = 'A1'
+    expected = "A\n1"
+    expect(Transpose.transpose lines).toEqual expected
+
+  xit 'two characters in a column', ->
+    lines = "A\n1"
+    expected = 'A1'
+    expect(Transpose.transpose lines).toEqual expected
+
+  xit 'simple', ->
+    lines = [
+      'ABC'
+      '123'
+    ].join '\n'
+    expected = [
+      'A1'
+      'B2'
+      'C3'
+    ].join '\n'
+    expect(Transpose.transpose lines).toEqual expected
+
+  xit 'single line', ->
+    lines = 'Single line.'
+    expected = [
+      'S'
+      'i'
+      'n'
+      'g'
+      'l'
+      'e'
+      ' '
+      'l'
+      'i'
+      'n'
+      'e'
+      '.'
+    ].join '\n'
+    expect(Transpose.transpose lines).toEqual expected
+
+  xit 'first line longer than second line', ->
+    lines = [
+      'The fourth line.'
+      'The fifth line.'
+    ].join'\n'
+    expected = [
+      'TT'
+      'hh'
+      'ee'
+      '  '
+      'ff'
+      'oi'
+      'uf'
+      'rt'
+      'th'
+      'h '
+      ' l'
+      'li'
+      'in'
+      'ne'
+      'e.'
+      '.'
+    ].join '\n'
+    expect(Transpose.transpose lines).toEqual expected
+
+  xit 'second line longer than first line', ->
+    lines = [
+      'The first line.'
+      'The second line.'
+    ].join('\n')
+    expected = [
+      'TT'
+      'hh'
+      'ee'
+      '  '
+      'fs'
+      'ie'
+      'rc'
+      'so'
+      'tn'
+      ' d'
+      'l '
+      'il'
+      'ni'
+      'en'
+      '.e'
+      ' .'
+    ].join '\n'
+    expect(Transpose.transpose lines).toEqual expected
+
+  xit 'mixed line length', ->
+    lines = [
+      'The longest line.'
+      'A long line.'
+      'A longer line.'
+      'A line.'
+    ].join '\n'
+    expected = [
+      'TAAA'
+      'h   '
+      'elll'
+      ' ooi'
+      'lnnn'
+      'ogge'
+      'n e.'
+      'glr'
+      'ei '
+      'snl'
+      'tei'
+      ' .n'
+      'l e'
+      'i .'
+      'n'
+      'e'
+      '.'
+    ].join '\n'
+    expect(Transpose.transpose lines).toEqual expected
+
+  xit 'square', ->
+    lines = [
+      'HEART'
+      'EMBER'
+      'ABUSE'
+      'RESIN'
+      'TREND'
+    ].join '\n'
+    expected = [
+      'HEART'
+      'EMBER'
+      'ABUSE'
+      'RESIN'
+      'TREND'
+    ].join '\n'
+    expect(Transpose.transpose lines).toEqual expected
+
+  xit 'rectangle', ->
+    lines = [
+      'FRACTURE'
+      'OUTLINED'
+      'BLOOMING'
+      'SEPTETTE'
+    ].join '\n'
+    expected = [
+      'FOBS'
+      'RULE'
+      'ATOP'
+      'CLOT'
+      'TIME'
+      'UNIT'
+      'RENT'
+      'EDGE'
+    ].join '\n'
+    expect(Transpose.transpose lines).toEqual expected
+
+  xit 'triangle', ->
+    lines = [
+      'T'
+      'EE'
+      'AAA'
+      'SSSS'
+      'EEEEE'
+      'RRRRRR'
+    ].join '\n'
+    expected = [
+      'TEASER'
+      ' EASER'
+      '  ASER'
+      '   SER'
+      '    ER'
+      '     R'
+    ].join '\n'
+    expect(Transpose.transpose lines).toEqual expected
+
+  xit 'jagged triangle', ->
+    lines = [
+      '11'
+      '2'
+      '3333'
+      '444'
+      '555555'
+      '66666'
+    ].join '\n'
+    expected = [
+      '123456'
+      '1 3456'
+      '  3456'
+      '  3 56'
+      '    56'
+      '    5'
+    ].join '\n'
+    expect(Transpose.transpose lines).toEqual expected