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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. | ||
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'. | ||
- The last row contains one 'A'. | ||
- All rows, except the first and last, have exactly two identical letters. | ||
- All rows have as many trailing spaces as leading spaces. (This might be 0). | ||
- The diamond is horizontally symmetric. | ||
- The diamond is vertically symmetric. | ||
- The diamond has a square shape (width equals height). | ||
- The letters form a diamond shape. | ||
- The top half has the letters in ascending order. | ||
- The bottom half has the letters in descending order. | ||
- 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 | ||
A | ||
``` | ||
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Diamond for letter 'C': | ||
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```text | ||
··A·· | ||
·B·B· | ||
C···C | ||
·B·B· | ||
··A·· | ||
``` | ||
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Diamond for letter 'E': | ||
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```text | ||
····A···· | ||
···B·B··· | ||
··C···C·· | ||
·D·····D· | ||
E·······E | ||
·D·····D· | ||
··C···C·· | ||
···B·B··· | ||
····A···· | ||
``` |
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YS_VERSION := 0.1.75 |
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SHELL := bash | ||
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BASE := $(shell pwd) | ||
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include .yamlscript/exercise.mk | ||
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YS_LOCAL_PREFIX := ../../../../.local/v$(YS_VERSION) | ||
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YS_LOCAL_BIN := $(YS_LOCAL_PREFIX)/bin | ||
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YS_BIN := $(YS_LOCAL_BIN)/ys-$(YS_VERSION) | ||
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TEST_FILE ?= $(wildcard *-test.ys) | ||
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export PATH := $(YS_LOCAL_BIN):$(PATH) | ||
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export YSPATH := $(BASE) | ||
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default: | ||
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test: $(YS_BIN) | ||
prove -v $(TEST_FILE) | ||
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$(YS_BIN): | ||
curl -s https://yamlscript.org/install | \ | ||
BIN=1 VERSION=$(YS_VERSION) PREFIX=$(YS_LOCAL_PREFIX) bash >/dev/null |
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{ | ||
"authors": [ | ||
"ingydotnet" | ||
], | ||
"files": { | ||
"solution": [ | ||
"diamond.ys" | ||
], | ||
"test": [ | ||
"diamond-test.ys", | ||
"GNUmakefile", | ||
"Makefile", | ||
".yamlscript/exercise.mk", | ||
".yamlscript/exercism-ys-installer" | ||
], | ||
"example": [ | ||
".meta/diamond.ys" | ||
] | ||
}, | ||
"blurb": "Given a letter, print a diamond starting with 'A' with the supplied letter at the widest point.", | ||
"source": "Seb Rose", | ||
"source_url": "https://web.archive.org/web/20220807163751/http://claysnow.co.uk/recycling-tests-in-tdd/" | ||
} |
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#!/usr/bin/env ys-0 | ||
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require ys::taptest: :all | ||
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use: diamond | ||
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test:: | ||
- name: Degenerate case with a single 'a' row | ||
code: rows("A") | ||
want: |2 | ||
A | ||
uuid: 202fb4cc-6a38-4883-9193-a29d5cb92076 | ||
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- name: Degenerate case with no row containing 3 distinct groups of spaces | ||
code: rows("B") | ||
want: |2 | ||
A | ||
B B | ||
A | ||
uuid: bd6a6d78-9302-42e9-8f60-ac1461e9abae | ||
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- name: Smallest non-degenerate case with odd diamond side length | ||
code: rows("C") | ||
want: |2 | ||
A | ||
B B | ||
C C | ||
B B | ||
A | ||
uuid: af8efb49 14ed-447f-8944-4cc59ce3fd76 | ||
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- name: Smallest non-degenerate case with even diamond side length | ||
code: rows("D") | ||
want: |2 | ||
A | ||
B B | ||
C C | ||
D D | ||
C C | ||
B B | ||
A | ||
uuid: e0c19a95 9888-4d05-86a0-fa81b9e70d1d | ||
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- name: Largest possible diamond | ||
code: rows("Z") | ||
want: |2 | ||
A | ||
B B | ||
C C | ||
D D | ||
E E | ||
F F | ||
G G | ||
H H | ||
I I | ||
J J | ||
K K | ||
L L | ||
M M | ||
N N | ||
O O | ||
P P | ||
Q Q | ||
R R | ||
S S | ||
T T | ||
U U | ||
V V | ||
W W | ||
X X | ||
Y Y | ||
Z Z | ||
Y Y | ||
X X | ||
W W | ||
V V | ||
U U | ||
T T | ||
S S | ||
R R | ||
Q Q | ||
P P | ||
O O | ||
N N | ||
M M | ||
L L | ||
K K | ||
J J | ||
I I | ||
H H | ||
G G | ||
F F | ||
E E | ||
D D | ||
C C | ||
B B | ||
A | ||
uuid: 82ea9aa9 4c0e-442a-b07e-40204e925944 | ||
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done: 5 |
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!yamlscript/v0 | ||
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defn rows(letter): | ||
text: | ||
loop N int(letter.0), I (' ' * (((N - 64) * 2) - 3)), O '', lines []: | ||
line =: if(I.?, "$O$char(N)$I$char(N)$O" "${O}A$O") | ||
lines =: if(lines.? ([line] + lines + [line]) [line]) | ||
if I.! lines: recur(N.--, join(drop(2 I)), "$O ", lines) |
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# 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. | ||
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[202fb4cc-6a38-4883-9193-a29d5cb92076] | ||
description = "Degenerate case with a single 'A' row" | ||
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[bd6a6d78-9302-42e9-8f60-ac1461e9abae] | ||
description = "Degenerate case with no row containing 3 distinct groups of spaces" | ||
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[af8efb49-14ed-447f-8944-4cc59ce3fd76] | ||
description = "Smallest non-degenerate case with odd diamond side length" | ||
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[e0c19a95-9888-4d05-86a0-fa81b9e70d1d] | ||
description = "Smallest non-degenerate case with even diamond side length" | ||
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[82ea9aa9-4c0e-442a-b07e-40204e925944] | ||
description = "Largest possible diamond" |
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YS_VERSION := 0.1.75 |
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