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Add new practice exercise: secret-handshake (#123)
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‎config.json

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"prerequisites": [],
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"difficulty": 5
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},
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{
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"slug": "secret-handshake",
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"name": "Secret Handshake",
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"uuid": "2b10f220-4a5f-437f-b982-58914baa9ec1",
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"practices": [],
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"prerequisites": [],
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"difficulty": 5
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},
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{
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"slug": "swift-scheduling",
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"name": "Swift Scheduling",

‎exercises/practice/secret-handshake/.docs/instructions.md

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# Instructions
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Your task is to convert a number between 1 and 31 to a sequence of actions in the secret handshake.
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The sequence of actions is chosen by looking at the rightmost five digits of the number once it's been converted to binary.
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Start at the right-most digit and move left.
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The actions for each number place are:
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```plaintext
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00001 = wink
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00010 = double blink
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00100 = close your eyes
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01000 = jump
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10000 = Reverse the order of the operations in the secret handshake.
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```
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Let's use the number `9` as an example:
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- 9 in binary is `1001`.
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- The digit that is farthest to the right is 1, so the first action is `wink`.
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- Going left, the next digit is 0, so there is no double-blink.
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- Going left again, the next digit is 0, so you leave your eyes open.
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- Going left again, the next digit is 1, so you jump.
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That was the last digit, so the final code is:
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```plaintext
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wink, jump
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```
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Given the number 26, which is `11010` in binary, we get the following actions:
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- double blink
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- jump
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- reverse actions
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The secret handshake for 26 is therefore:
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```plaintext
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jump, double blink
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```
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~~~~exercism/note
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If you aren't sure what binary is or how it works, check out [this binary tutorial][intro-to-binary].
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[intro-to-binary]: https://medium.com/basecs/bits-bytes-building-with-binary-13cb4289aafa
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~~~~

‎exercises/practice/secret-handshake/.docs/introduction.md

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# Introduction
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You are starting a secret coding club with some friends and friends-of-friends.
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Not everyone knows each other, so you and your friends have decided to create a secret handshake that you can use to recognize that someone is a member.
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You don't want anyone who isn't in the know to be able to crack the code.
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You've designed the code so that one person says a number between 1 and 31, and the other person turns it into a series of actions.

‎exercises/practice/secret-handshake/.meta/config.json

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{
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"authors": [
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"jimmytty"
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],
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"files": {
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"solution": [
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"secret-handshake.sql"
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],
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"test": [
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"secret-handshake_test.sql"
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],
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"example": [
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".meta/example.sql"
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]
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},
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"blurb": "Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.",
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"source": "Bert, in Mary Poppins",
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"source_url": "https://www.imdb.com/title/tt0058331/quotes/?item=qt0437047"
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}

‎exercises/practice/secret-handshake/.meta/example.sql

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UPDATE "secret-handshake"
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SET result = (
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SELECT COALESCE(GROUP_CONCAT(j.value, ', '), '')
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FROM (
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SELECT
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JSON_ARRAY(
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IIF((number >> 3) & 1, 'jump' , NULL),
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IIF((number >> 2) & 1, 'close your eyes', NULL),
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IIF((number >> 1) & 1, 'double blink' , NULL),
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IIF((number >> 0) & 1, 'wink' , NULL)
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) AS commands
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), JSON_EACH(commands) j
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WHERE j.value NOTNULL
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)
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WHERE (number >> 4) & 1 = 1
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;
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UPDATE "secret-handshake"
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SET result = (
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SELECT COALESCE(GROUP_CONCAT(j.value, ', '), '')
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FROM (
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SELECT
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JSON_ARRAY(
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IIF((number >> 0) & 1, 'wink' , NULL),
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IIF((number >> 1) & 1, 'double blink' , NULL),
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IIF((number >> 2) & 1, 'close your eyes', NULL),
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IIF((number >> 3) & 1, 'jump' , NULL)
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) AS commands
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), JSON_EACH(commands) j
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WHERE j.value NOTNULL
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)
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WHERE (number >> 4) & 1 = 0
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;

‎exercises/practice/secret-handshake/.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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[b8496fbd-6778-468c-8054-648d03c4bb23]
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description = "wink for 1"
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[83ec6c58-81a9-4fd1-bfaf-0160514fc0e3]
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description = "double blink for 10"
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[0e20e466-3519-4134-8082-5639d85fef71]
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description = "close your eyes for 100"
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[b339ddbb-88b7-4b7d-9b19-4134030d9ac0]
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description = "jump for 1000"
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[40499fb4-e60c-43d7-8b98-0de3ca44e0eb]
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description = "combine two actions"
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[9730cdd5-ef27-494b-afd3-5c91ad6c3d9d]
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description = "reverse two actions"
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[0b828205-51ca-45cd-90d5-f2506013f25f]
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description = "reversing one action gives the same action"
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[9949e2ac-6c9c-4330-b685-2089ab28b05f]
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description = "reversing no actions still gives no actions"
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[23fdca98-676b-4848-970d-cfed7be39f81]
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description = "all possible actions"
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[ae8fe006-d910-4d6f-be00-54b7c3799e79]
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description = "reverse all possible actions"
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[3d36da37-b31f-4cdb-a396-d93a2ee1c4a5]
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description = "do nothing for zero"

‎exercises/practice/secret-handshake/create_fixture.sql

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DROP TABLE IF EXISTS "secret-handshake";
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CREATE TABLE "secret-handshake" (
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number INTEGER NOT NULL,
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result TEXT
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);
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.mode csv
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.import ./data.csv "secret-handshake"
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UPDATE "secret-handshake" SET result = NULL;

‎exercises/practice/secret-handshake/create_test_table.sql

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DROP TABLE IF EXISTS tests;
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CREATE TABLE IF NOT EXISTS tests (
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-- uuid and description are taken from the test.toml file
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uuid TEXT PRIMARY KEY,
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description TEXT NOT NULL,
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-- The following section is needed by the online test-runner
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status TEXT DEFAULT 'fail',
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message TEXT,
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output TEXT,
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test_code TEXT,
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task_id INTEGER DEFAULT NULL,
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-- Here are columns for the actual tests
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number INTEGER NOT NULL,
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expected TEXT NOT NULL
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);
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INSERT INTO tests (uuid, description, number, expected)
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VALUES
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('b8496fbd-6778-468c-8054-648d03c4bb23', 'wink for 1', 1, 'wink'),
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('83ec6c58-81a9-4fd1-bfaf-0160514fc0e3', 'double blink for 10', 2, 'double blink'),
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('0e20e466-3519-4134-8082-5639d85fef71', 'close your eyes for 100', 4, 'close your eyes'),
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('b339ddbb-88b7-4b7d-9b19-4134030d9ac0', 'jump for 1000', 8, 'jump'),
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('40499fb4-e60c-43d7-8b98-0de3ca44e0eb', 'combine two actions', 3, 'wink, double blink'),
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('9730cdd5-ef27-494b-afd3-5c91ad6c3d9d', 'reverse two actions', 19, 'double blink, wink'),
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('0b828205-51ca-45cd-90d5-f2506013f25f', 'reversing one action gives the same action', 24, 'jump'),
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('9949e2ac-6c9c-4330-b685-2089ab28b05f', 'reversing no actions still gives no actions', 16, ''),
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('23fdca98-676b-4848-970d-cfed7be39f81', 'all possible actions', 15, 'wink, double blink, close your eyes, jump'),
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('ae8fe006-d910-4d6f-be00-54b7c3799e79', 'reverse all possible actions', 31, 'jump, close your eyes, double blink, wink'),
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('3d36da37-b31f-4cdb-a396-d93a2ee1c4a5', 'do nothing for zero', 0, '');

‎exercises/practice/secret-handshake/data.csv

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1,""
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2,""
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4,""
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8,""
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3,""
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19,""
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24,""
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16,""
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15,""
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31,""
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0,""

‎exercises/practice/secret-handshake/secret-handshake.sql

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-- Schema:
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-- CREATE TABLE "secret-handshake" (
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-- number INTEGER NOT NULL,
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-- result TEXT
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-- );
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--
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-- Task: update secret-handshake table and set result column based on the number.

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