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* New exercise: Pop Count * some review suggestions * remove a tricky sed call
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#!/usr/bin/env bash | ||
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set -euo pipefail | ||
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if (( $# != 1 )); then | ||
echo >&2 "Populates a new directory for a practice exercise." | ||
echo >&2 "Usage: $0 <exercise-slug>" | ||
exit 1 | ||
fi | ||
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die() { echo >&2 "$*"; exit 1; } | ||
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required_tool() { | ||
command -v "$1" >/dev/null 2>&1 || | ||
die "$1 is required but not installed. Please install it and make sure it's in your PATH." | ||
} | ||
required_tool jq | ||
required_tool curl | ||
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[[ -f ./bin/fetch-configlet ]] || die "run this script from the repo's root directory." | ||
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slug="${1}" | ||
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# transform slug 'resistor-color-duo' to name 'Resistor Color Duo' | ||
IFS=- read -ra words <<< "${slug}" | ||
name=${words[*]^} | ||
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it_exists=$( | ||
jq --arg slug "${slug}" ' | ||
.exercises.practice | ||
| map(select(.slug == $slug)) | ||
| length > 0 | ||
' config.json | ||
) | ||
[[ ${it_exists} == false ]] || die "${slug} already exists in config.json" | ||
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# Add entry for exercise in config.json | ||
./bin/fetch-configlet | ||
jq --arg slug "${slug}" \ | ||
--arg uuid "$(./bin/configlet uuid)" \ | ||
--arg name "${name}" \ | ||
' | ||
.exercises.practice += [ | ||
{ | ||
slug: $slug, | ||
name: $name, | ||
uuid: $uuid, | ||
practices: [], | ||
prerequisites: [], | ||
difficulty: 1 | ||
} | ||
] | ||
' config.json > config.json.tmp \ | ||
&& mv config.json.tmp config.json | ||
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# Sync the exercise | ||
./bin/configlet sync --update --yes \ | ||
--tests include \ | ||
--metadata \ | ||
--docs \ | ||
--exercise "${slug}" | ||
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touch "exercises/practice/${slug}/.meta/example.jq" | ||
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echo '"Remove this line and implement your solution" | halt_error' > "exercises/practice/${slug}/${slug}.jq" | ||
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echo | ||
read -rp 'Your github username: ' author | ||
conf="exercises/practice/${slug}/.meta/config.json" | ||
jq --arg slug "${slug}" \ | ||
--arg author "${author}" \ | ||
' | ||
.authors = [$author] | | ||
.files = { | ||
solution: [$slug + ".jq"], | ||
test: ["test-\($slug).bats"], | ||
example: [".meta/example.jq"] | ||
} | ||
' "${conf}" > "${conf}.tmp" \ | ||
&& mv "${conf}.tmp" "${conf}" | ||
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cp exercises/practice/hello-world/bats-extra.bash exercises/practice/"${slug}" | ||
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./bin/generate_tests "${slug}" | ||
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echo | ||
find "exercises/practice/${slug}" -type f -ls | ||
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cat << NEXT_STEPS | ||
Your next steps are: | ||
- Review the test suite in 'exercises/practice/${slug}/test-${slug}.jq' | ||
- Any test cases you don't implement, mark them in 'exercises/practice/${slug}/.meta/tests.toml' with "include = false" | ||
- Create the example solution in 'exercises/practice/${slug}/.meta/example.jq' | ||
- Verify the example solution by running 'bin/validate_one_exercise exercises/practice/${slug}' | ||
- Review the stub solution in 'exercises/practice/${slug}/${slug}.jq' | ||
- Update the 'difficulty' value for the exercise's entry in the 'config.json' file | ||
- Validate CI using 'bin/configlet lint' | ||
NEXT_STEPS |
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# Instructions | ||
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Your task is to count the number of 1 bits in the binary representation of a number. | ||
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## Restrictions | ||
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Keep your hands off that bit-count functionality provided by your standard library! | ||
Solve this one yourself using other basic tools instead. |
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# Introduction | ||
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Your friend Eliud inherited a farm from her grandma Tigist. | ||
Her granny was an inventor and had a tendency to build things in an overly complicated manner. | ||
The chicken coop has a digital display showing an encoded number representing the positions of all eggs that could be picked up. | ||
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Eliud is asking you to write a program that shows the actual number of eggs in the coop. | ||
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The position information encoding is calculated as follows: | ||
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1. Scan the potential egg-laying spots and mark down a `1` for an existing egg or a `0` for an empty spot. | ||
2. Convert the number from binary to decimal. | ||
3. Show the result on the display. | ||
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Example 1: | ||
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```text | ||
Chicken Coop: | ||
_ _ _ _ _ _ _ | ||
|E| |E|E| | |E| | ||
Resulting Binary: | ||
1 0 1 1 0 0 1 | ||
Decimal number on the display: | ||
89 | ||
Actual eggs in the coop: | ||
4 | ||
``` | ||
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Example 2: | ||
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```text | ||
Chicken Coop: | ||
_ _ _ _ _ _ _ _ | ||
| | | |E| | | | | | ||
Resulting Binary: | ||
0 0 0 1 0 0 0 0 | ||
Decimal number on the display: | ||
16 | ||
Actual eggs in the coop: | ||
1 | ||
``` |
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{ | ||
"authors": [ | ||
"glennj" | ||
], | ||
"files": { | ||
"solution": [ | ||
"pop-count.jq" | ||
], | ||
"test": [ | ||
"test-pop-count.bats" | ||
], | ||
"example": [ | ||
".meta/example.jq" | ||
] | ||
}, | ||
"blurb": "Count the 1 bits in a number", | ||
"source": "Christian Willner, Eric Willigers", | ||
"source_url": "https://forum.exercism.org/t/new-exercise-suggestion-pop-count/7632/5" | ||
} |
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# jq does not have bitwise operators | ||
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def count_eggs(count): | ||
if . == 0 then | ||
count | ||
else | ||
[(. / 2 | floor), . % 2] as [$next, $bit] | ||
| $next | count_eggs(count + $bit) | ||
end | ||
; | ||
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.number | count_eggs(0) |
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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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[559e789d-07d1-4422-9004-3b699f83bca3] | ||
description = "0 eggs" | ||
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[97223282-f71e-490c-92f0-b3ec9e275aba] | ||
description = "1 egg" | ||
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[1f8fd18f-26e9-4144-9a0e-57cdfc4f4ff5] | ||
description = "4 eggs" | ||
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[0c18be92-a498-4ef2-bcbb-28ac4b06cb81] | ||
description = "13 eggs" |
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