tdd-katas
1) Leap Year kata
Write a function that returns true or false depending on whether its input integer is a leap year or not.
A leap year is divisible by 4, but is not otherwise divisible by 100 unless it is also divisible by 400.
2001 is a typical common year 1996 is a typical leap year 1900 is an atypical common year 2000 is an atypical leap year
2) Human Readable Time
Write a function, which takes a non-negative integer (seconds) as input and returns the time in a human-readable format (HH:MM:SS)
HH = hours, padded to 2 digits, range: 00 - 99 MM = minutes, padded to 2 digits, range: 00 - 59 SS = seconds, padded to 2 digits, range: 00 - 59 The maximum time never exceeds 359999 (99:59:59)
Resources: https://www.codewars.com/kata/52685f7382004e774f0001f7/train/java https://www.programmingwithwolfgang.com/tdd-kata/
3) Word Counter
A method that, given a delimited string, returns a collection of all of the unique words in it and the count of how many times they occurred. Start off with a space between words, but later other delimiters wil be added.
Example input:
"boom,bang,boom"
Which would produce the following result:
boom, 2
bang, 1
4) Ohce
https://kata-log.rocks/ohce-kata
A short and simple exercise to practice outside-in TDD using test doubles.
ohce is a console application that echoes the reverse of what you input through the console.
Even though it seems a silly application, ohce knows a thing or two.
When you start oche, it greets you differently depending on the current time, but only in Spanish: Between 20 and 6 hours, ohce will greet you saying: ¡Buenas noches < your name >! Between 6 and 12 hours, ohce will greet you saying: ¡Buenos días < your name >! Between 12 and 20 hours, ohce will greet you saying: ¡Buenas tardes < your name >! When you introduce a palindrome, ohce likes it and after reverse-echoing it, it adds ¡Bonita palabra! ohce knows when to stop, you just have to write Stop! and it'll answer Adios < your name > and end. This is an example of using ohce during the morning:
$ ohce Pedro
¡Buenos días Pedro! $ hola aloh $ oto oto ¡Bonita palabra! $ stop pots $ Stop! Adios Pedro
5) Ease the Stock Broker
https://www.codewars.com/kata/ease-the-stockbroker/discuss/java
Description:
Clients place orders to a stockbroker as strings. The order can be simple or multiple.
Type of a simple order: Quote/white-space/Quantity/white-space/Price/white-space/Status
where Quote is formed of non-whitespace character, Quantity is an int, Price a double (with mandatory decimal point "." ), Status is represented by the letter B (buy) or the letter S (sell).
Example:
"GOOG 300 542.0 B"
A multiple order is the concatenation of simple orders with a comma between each.
Example:
"ZNGA 1300 2.66 B, CLH15.NYM 50 56.32 B, OWW 1000 11.623 B, OGG 20 580.1 B"
or (C)
"ZNGA 1300 2.66 B,CLH15.NYM 50 56.32 B,OWW 1000 11.623 B,OGG 20 580.1 B"
To ease the stockbroker your task is to produce a string of type
"Buy: b Sell: s" where b and s are 'double' formatted with no decimal, b representing the total price of bought stocks and s the total price of sold stocks.
Example:
"Buy: 294990 Sell: 0"
Unfortunately sometimes clients make mistakes. When you find mistakes in orders, you must pinpoint these badly formed orders and produce a string of type:
"Buy: b Sell: s; Badly formed nb: badly-formed 1st simple order ;badly-formed nth simple order ;"
where nb is the number of badly formed simple orders, b representing the total price of bought stocks with correct simple order and s the total price of sold stocks with correct simple order.
Examples:
"Buy: 263 Sell: 11802; Badly formed 2: CLH16.NYM 50 56 S ;OWW 1000 11 S ;"
"Buy: 100 Sell: 56041; Badly formed 1: ZNGA 1300 2.66 ;"