10000 2020-11-28 Update: Added "A Needle in the haystack" and "Get the Midd… · fartem/codewars-java@f1b6446 · GitHub
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2020-11-28 Update: Added "A Needle in the haystack" and "Get the Middle Character"
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‎README.md

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@@ -16,6 +16,7 @@ Profile on Codewars: [fartem](https://www.codewars.com/users/fartem).
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| --- | --- | --- |
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| Abbreviate a Two Word Name | [Link](https://www.codewars.com/kata/57eadb7ecd143f4c9c0000a3) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu8/AbbreviateATwoWordName.java) |
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| altERnaTIng cAsE <=> ALTerNAtiNG CaSe | [Link](https://www.codewars.com/kata/56efc695740d30f963000557) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu8/AltERnaTIngcAsEALTerNAtiNGCaSe.java) |
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| A Needle in the Haystack | [Link](https://www.codewars.com/kata/56676e8fabd2d1ff3000000c) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu8/ANeedleInTheHaystack.java) |
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| Array plus array | [Link](https://www.codewars.com/kata/5a2be17aee1aaefe2a000151) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu8/ArrayPlusArray.java) |
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| Basic variable assignment | [Link](https://www.codewars.com/kata/50ee6b0bdeab583673000025) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu8/BasicVariableAssignment.java) |
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| Calculate average | [Link](https://www.codewars.com/kata/57a2013acf1fa5bfc4000921) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu8/CalculateAverage.java) |
@@ -96,6 +97,7 @@ Profile on Codewars: [fartem](https://www.codewars.com/users/fartem).
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| Form The Minimum | [Link](https://www.codewars.com/kata/5ac6932b2f317b96980000ca) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/FormTheMinimum.java) |
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| Fun with lists: indexOf | [Link](https://www.codewars.com/kata/581c6b075cfa83852700021f) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/FunWithListsIndexOf.java) |
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| Fun with lists: length | [Link](https://www.codewars.com/kata/581e476d5f59408553000a4b) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/FunWithListsLength.java) |
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| Get the Middle Character | [Link](https://www.codewars.com/kata/56747fd5cb988479af000028) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/GetTheMiddleCharacter.java) |
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| Greatest common divisor | [Link](https://www.codewars.com/kata/5500d54c2ebe0a8e8a0003fd) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/GreatestCommonDivisor.java) |
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| Highest and Lowest | [Link](https://www.codewars.com/kata/554b4ac871d6813a03000035) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/HighestAndLowest.java) |
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| How many arguments | [Link](https://www.codewars.com/kata/5c44b0b200ce187106452139) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/HowManyArguments.java) |

‎src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/GetTheMiddleCharacter.java

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package com.smlnskgmail.jaman.codewarsjava.kyu7;
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// https://www.codewars.com/kata/56747fd5cb988479af000028
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public class GetTheMiddleCharacter {
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private final String input;
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public GetTheMiddleCharacter(String input) {
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this.input = input;
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}
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public String solution() {
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int inputLength = input.length();
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return inputLength % 2 == 0
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? input.substring(inputLength / 2 - 1, inputLength / 2 + 1)
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: String.valueOf(input.charAt(inputLength / 2));
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}
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}

‎src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu8/ANeedleInTheHaystack.java

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package com.smlnskgmail.jaman.codewarsjava.kyu8;
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import java.util.stream.IntStream;
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// https://www.codewars.com/kata/56676e8fabd2d1ff3000000c
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public class ANeedleInTheHaystack {
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private final Object[] input;
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public ANeedleInTheHaystack(Object[] input) {
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this.input = input;
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}
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public String solution() {
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int index = IntStream
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.range(0, input.length)
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.filter(value -> {
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Object data = input[value];
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return data instanceof String && data.equals("needle");
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})
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.findFirst()
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.orElse(-1);
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return String.format(
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"found the needle at position %d",
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index
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);
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}
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}

‎src/test/java/com/smlnskgmail/jaman/codewarsjava/kyu7/GetTheMiddleCharacterTest.java

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package com.smlnskgmail.jaman.codewarsjava.kyu7;
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import org.junit.Test;
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import static org.junit.Assert.assertEquals;
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public class GetTheMiddleCharacterTest {
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@Test
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p B41A ublic void evenTests() {
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assertEquals(
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"es",
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new GetTheMiddleCharacter("test").solution()
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);
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assertEquals(
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"dd",
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new GetTheMiddleCharacter("middle").solution()
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);
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}
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@Test
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public void oddTests() {
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assertEquals(
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"t",
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new GetTheMiddleCharacter("testing").solution()
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);
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assertEquals(
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"A",
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new GetTheMiddleCharacter("A").solution()
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);
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}
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}

‎src/test/java/com/smlnskgmail/jaman/codewarsjava/kyu8/ANeedleInTheHaystackTest.java

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package com.smlnskgmail.jaman.codewarsjava.kyu8;
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import org.junit.Test;
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import static org.junit.Assert.assertEquals;
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public class ANeedleInTheHaystackTest {
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@Test
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public void tests() {
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assertEquals(
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"found the needle at position 3",
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new ANeedleInTheHaystack(
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new Object[]{
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"3",
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"123124234",
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null,
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"needle",
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"world",
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"hay",
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2,
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"3",
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true,
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false
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}
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).solution()
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);
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assertEquals(
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"found the needle at position 5",
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new ANeedleInTheHaystack(
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new Object[]{
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"283497238987234",
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"a dog",
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"a cat",
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"some random junk",
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"a piece of hay",
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"needle",
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"something somebody lost a while ago"
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}
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).solution()
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);
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assertEquals(
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"found the needle at position 30",
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new ANeedleInTheHaystack(
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new Object[]{
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1,
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2,
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3,
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4,
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5,
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6,
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7,
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8,
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8,
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7,
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5,
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4,
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3,
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4,
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5,
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6,
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67,
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5,
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5,
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3,
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3,
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4,
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2,
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34,
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234,
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23,
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4,
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234,
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324,
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324,
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"needle",
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1,
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2,
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3,
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4,
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5,
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5,
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6,
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5,
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4,
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32,
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3,
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45,
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54
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}
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).solution()
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);
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}
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}

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