https://github.com/notbobthebuilder/12-katas-of-christmas
12 Katas to perform over the 12 days of christmas
https://github.com/notbobthebuilder/12-katas-of-christmas
Last synced: 4 months ago
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12 Katas to perform over the 12 days of christmas
- Host: GitHub
- URL: https://github.com/notbobthebuilder/12-katas-of-christmas
- Owner: NotBobTheBuilder
- Created: 2014-12-25T23:43:32.000Z (over 10 years ago)
- Default Branch: master
- Last Pushed: 2014-12-31T13:11:57.000Z (over 10 years ago)
- Last Synced: 2025-01-11T23:45:01.082Z (5 months ago)
- Size: 231 KB
- Stars: 2
- Watchers: 4
- Forks: 3
- Open Issues: 5
-
Metadata Files:
- Readme: README.md
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README
# 12 Katas of Christmas
12 katas [Simple, self contained problems], 1 released every day of Christmas.
To play:
1. Write solution
2. Optionally fork this repo, commit your implementation & file a PR
For more info on what Katas are, see [here](http://codekata.com/) or have a Google :)
The objective of a kata is to solve it yourself and learn from the process. While Git & GitHub aren’t part of that process, you may find it interesting to submit your solutions in a PR to this repository. More info on that process is available [here](https://help.github.com/articles/fork-a-repo/).
Note: I don’t know whether the 12 days begin on Christmas Day or Boxing Day. If it’s Boxing Day - great; I knew that. If it’s Christmas Day, assume this is a joke about off by one errors or something witty like that.
## Kata 01
Write a program to determine whether a `word` is `even`; where
- a `word` is an arbitrary length letter sequence using only a-z or A-Z
- a `word` is `even` when the product of its letters’ integer values is even
- a letter’s integer value is its index in the alphabet; so a=1, b=2 (A=1 too)
Your program should read in a word from standard input; and write out the string "true" if the word is even, or "false" otherwise.
Examples input -> output:
- `aaa` -> `false`
- `bbb` -> `true`
## Kata 02
All time and accounting of it is inherently evil. Dates are evil, clocks are evil and [time zones are especially evil](http://stackoverflow.com/questions/6841333/why-is-subtracting-these-two-times-in-1927-giving-a-strange-result/6841479#6841479).
Write a program which reads in an [ISO 8601 date](https://en.wikipedia.org/wiki/ISO_8601) - for example, 2014-12-25 - and prints out the US & UK variants, and spoken form including month.
It will be more rewarding to avoid your language’s inbuilt Date/Time utilities.
Examples input -> output:
- `2014-12-25` ->
US: 12/25/2014
UK: 25/12/2014
Spoken: 25th of December 2014
- `2015-01-01` ->
US: 01/01/2015
UK: 01/01/2015
Spoken: 1st of January 2015
## Kata 03
7 Segment Displays look like this, when all cells are switched on:
—
| |
—
| |
—
Write a program which reads in two numbers, and shows which 7-segment cells are common between them.
Examples input -> output
- `1 8` ->
|
|
- `2 5` ->
—
—
—
## Kata 04
An IPv4 address is a 32 bit integer, often represented in “dot notation” where the number is divided into 4 8-bit segments written in base 10, separated by dots.
For example, the IP address `127.0.0.1` converts to `2130706433`:
2130706433 == 01111111 00000000 00000000 00000001
\ / \ / \ / \ /
127 . 0 . 0 . 1
Write a program which converts IPv4 addresses between dot notation and base 10 numerical form.
## Kata 05
Write a program which calculates the cheapest arrangement of taxis for a given size of group.
Assume it always costs £5 for a 4-person taxi, £7 pound for a 6 person taxi and £10 for a 10 person taxi.
Examples:
- `12` -> `0x4 2x6 0x10`
- `14` -> `1x4 0x6 1x10`
## Kata 06
Write a program which accepts 3 pairs of coordinates, which returns `true` if the final pair of coordinates are on the line joining the first two pairs.
Examples:
- `(0, 0) (5, 5) (1, 1)` -> `true`
- `(0, 0) (5, 5) (10, 0)` -> `false`
## Kata 07
Hexadecimal and decimal notations are both systems for representing integers.
Write a program which reads in a number in hexadecimal format, then converts to decimal.
Examples:
- `F` -> `15`
- `FF` -> `255`