84 lines
2.6 KiB
Markdown
84 lines
2.6 KiB
Markdown
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# Squeaky Clean
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Welcome to Squeaky Clean on Exercism's Java Track.
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If you need help running the tests or submitting your code, check out `HELP.md`.
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If you get stuck on the exercise, check out `HINTS.md`, but try and solve it without using those first :)
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## Introduction
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The Java `char` type represents the smallest addressable components of text.
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Multiple `char`s can comprise a string such as `"word"` or `char`s can be
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processed independently. Their literals have single quotes e.g. `'A'`.
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Java `char`s support Unicode encoding so in addition to the Latin character set
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pretty much all the writing systems in use worldwide can be represented,
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e.g. the Greek letter `'β'`.
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There are many builtin library methods to inspect and manipulate `char`s. These
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can be found as static methods of the `java.lang.Character` class.
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`char`s are sometimes used in conjunction with a `StringBuilder` object.
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This object has methods that allow a string to be constructed
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character by character and manipulated. At the end of the process
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`toString` can be called on it to output a complete string.
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## Instructions
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In this exercise you will implement a partial set of utility routines to help a developer
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clean up SqueakyClean names.
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In the 4 tasks you will gradually build up the `clean` method.
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A valid SqueakyClean name is comprised of zero or more letters and underscores.
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In all cases the input string is guaranteed to be non-null. Note that the `clean` method should treat an empty string as valid.
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## 1. Replace any spaces encountered with underscores
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Implement the (_static_) `SqueakyClean.clean()` method to replace any spaces with underscores. This also applies to leading and trailing spaces.
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```java
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SqueakyClean.clean("my Id");
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// => "my___Id"
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```
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## 2. Replace control characters with the upper case string "CTRL"
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Modify the (_static_) `SqueakyClean.clean()` method to replace control characters with the upper case string `"CTRL"`.
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```java
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SqueakyClean.clean("my\0Id");
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// => "myCTRLId",
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```
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## 3. Convert kebab-case to camelCase
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Modify the (_static_) `SqueakyClean.clean()` method to convert kebab-case to camelCase.
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```java
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SqueakyClean.clean("à-ḃç");
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// => "àḂç"
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```
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## 4. Omit characters that are not letters
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Modify the (_static_) `SqueakyClean.clean()` method to omit any characters that are not letters.
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```java
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SqueakyClean.clean("a1😀2😀3😀b");
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// => "ab"
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```
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## 5. Omit Greek lower case letters
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Modify the (_static_) `SqueakyClean.clean()` method to omit any Greek letters in the range 'α' to 'ω'.
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```java
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SqueakyClean.clean("MyΟβιεγτFinder");
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// => "MyΟFinder"
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```
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## Source
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### Created by
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- @ystromm
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