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colinleachcolinleach
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add practice exercise Diamond (#766)
* add practice exercise diamond * fixed example.jl glitch
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‎config.json

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"prerequisites": [],
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"difficulty": 3
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},
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{
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"slug": "diamond",
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"name": "Diamond",
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"uuid": "e082b59e-5c2a-4474-8c73-ceb623bcd858",
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"practices": [],
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"prerequisites": [],
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"difficulty": 3
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},
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{
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"slug": "matrix",
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"name": "Matrix",

‎exercises/practice/diamond/.docs/instructions.md

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# Instructions
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The diamond kata takes as its input a letter, and outputs it in a diamond shape.
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Given a letter, it prints a diamond starting with 'A', with the supplied letter at the widest point.
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## Requirements
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- The first row contains one 'A'.
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- The last row contains one 'A'.
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- All rows, except the first and last, have exactly two identical letters.
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- All rows have as many trailing spaces as leading spaces. (This might be 0).
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- The diamond is horizontally symmetric.
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- The diamond is vertically symmetric.
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- The diamond has a square shape (width equals height).
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- The letters form a diamond shape.
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- The top half has the letters in ascending order.
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- The bottom half has the letters in descending order.
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- The four corners (containing the spaces) are triangles.
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## Examples
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In the following examples, spaces are indicated by `·` characters.
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Diamond for letter 'A':
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```text
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A
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```
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Diamond for letter 'C':
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```text
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··A··
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·B·B·
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C···C
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·B·B·
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··A··
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```
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Diamond for letter 'E':
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```text
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····A····
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···B·B···
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··C···C··
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·D·····D·
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E·······E
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·D·····D·
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··C···C··
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···B·B···
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····A····
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```

‎exercises/practice/diamond/.meta/config.json

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{
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"authors": [
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"colinleach"
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],
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"files": {
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"solution": [
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"diamond.jl"
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],
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"test": [
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"runtests.jl"
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],
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"example": [
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".meta/example.jl"
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]
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},
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"blurb": "Given a letter, print a diamond starting with 'A' with the supplied letter at the widest point.",
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"source": "Seb Rose",
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"source_url": "https://web.archive.org/web/20220807163751/http://claysnow.co.uk/recycling-tests-in-tdd/"
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}

‎exercises/practice/diamond/.meta/example.jl

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function rows(letter)
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letter == "A" && return ["A"]
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letters = 'A':'Z' |> collect
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letter_index = findfirst(x -> x == only(letter), letters)
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rowslist = []
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# loop to the middle of the diamond
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for i in 1:letter_index
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row = [' ' for _ in 1:(2 * letter_index - 1)]
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row[letter_index - i + 1] = row[letter_index + i - 1] = letters[i]
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push!(rowslist, join(row))
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end
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# reflect most of the top half and concatenate
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vcat(rowslist, rowslist[(end - 1):-1:1])
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end

‎exercises/practice/diamond/.meta/tests.toml

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# This is an auto-generated file.
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#
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# Regenerating this file via `configlet sync` will:
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# - Recreate every `description` key/value pair
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# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
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# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
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# - Preserve any other key/value pair
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#
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# As user-added comments (using the # character) will be removed when this file
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# is regenerated, comments can be added via a `comment` key.
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[202fb4cc-6a38-4883-9193-a29d5cb92076]
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description = "Degenerate case with a single 'A' row"
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[bd6a6d78-9302-42e9-8f60-ac1461e9abae]
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description = "Degenerate case with no row containing 3 distinct groups of spaces"
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[af8efb49-14ed-447f-8944-4cc59ce3fd76]
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description = "Smallest non-degenerate case with odd diamond side length"
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[e0c19a95-9888-4d05-86a0-fa81b9e70d1d]
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description = "Smallest non-degenerate case with even diamond side length"
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[82ea9aa9-4c0e-442a-b07e-40204e925944]
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description = "Largest possible diamond"

‎exercises/practice/diamond/diamond.jl

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function rows(letter)
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end

‎exercises/practice/diamond/runtests.jl

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using Test
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include("diamond.jl")
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@testset verbose = true "tests" begin
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@testset "Degenerate case with a single 'A' row" begin
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@test rows("A") == ["A"]
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end
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@testset "Degenerate case with no row containing 3 distinct groups of spaces" begin
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@test rows("B") == [" A ", "B B", " A "]
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end
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@testset "Smallest non-degenerate case with odd diamond side length" begin
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result = [" A ", " B B ", "C C", " B B ", " A "]
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@test rows("C") == result
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end
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@testset "Smallest non-degenerate case with even diamond side length" begin
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result = [
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" A ",
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" B B ",
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" C C ",
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"D D",
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" C C ",
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" B B ",
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" A ",
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]
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@test rows("D") == result
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end
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@testset "Largest possible diamond" begin
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result = [
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" A ",
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" B B ",
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" C C ",
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" D D ",
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" E E ",
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" F F ",
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" G G ",
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" H H ",
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" I I ",
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" J J ",
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" K K ",
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" L L ",
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" M M ",
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" N N ",
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" O O ",
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" P P ",
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" Q Q ",
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" R R ",
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" S S ",
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" T T ",
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" U U ",
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" V V ",
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" W W ",
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" X X ",
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" Y Y ",
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"Z Z",
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" Y Y ",
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" X X ",
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" W W ",
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" V V ",
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" U U ",
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" T T ",
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" S S ",
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" R R ",
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" Q Q ",
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" P P ",
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" O O ",
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" N N ",
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" M M ",
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" L L ",
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" K K ",
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" J J ",
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" I I ",
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" H H ",
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" G G ",
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" F F ",
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" E E ",
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" D D ",
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" C C ",
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" B B ",
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" A ",
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]
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@test rows("Z") == result
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end
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end

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