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Kotlin - Finished Flatten Array

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Anthony C 2017-07-25 17:19:42 -04:00
parent 74b84a4290
commit 2eb0b89b53
41 changed files with 1199 additions and 53 deletions
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#Tue Jul 25 16:41:43 EDT 2017
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#Tue Jul 25 16:44:18 EDT 2017
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# Flatten Array
Take a nested list and return a single flattened list with all values except nil/null.
The challenge is to write a function that accepts an arbitrarily-deep nested list-like structure and returns a flattened structure without any nil/null values.
For Example
input: [1,[2,3,null,4],[null],5]
output: [1,2,3,4,5]
## Source
Interview Question [https://reference.wolfram.com/language/ref/Flatten.html](https://reference.wolfram.com/language/ref/Flatten.html)
## Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.

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kotlin/flatten-array/build.gradle Normal file
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buildscript {
ext.kotlin_version = '1.1.1'
repositories {
mavenCentral()
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dependencies {
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
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apply plugin: 'kotlin'
repositories {
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dependencies {
compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
testCompile 'junit:junit:4.12'
testCompile "org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version"
}
test {
testLogging {
exceptionFormat = 'full'
events = ["passed", "failed", "skipped"]
}
}

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kotlin/flatten-array/flatten-array.iml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<module external.linked.project.id="flatten-array" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" external.system.module.group="" external.system.module.version="unspecified" type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager" inherit-compiler-output="true">
<exclude-output />
<content url="file://$MODULE_DIR$">
<excludeFolder url="file://$MODULE_DIR$/.gradle" />
<excludeFolder url="file://$MODULE_DIR$/build" />
<excludeFolder url="file://$MODULE_DIR$/out" />
</content>
<orderEntry type="inheritedJdk" />
<orderEntry type="sourceFolder" forTests="false" />
</component>
</module>

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kotlin/flatten-array/src/main/kotlin/.keep Normal file
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kotlin/flatten-array/src/main/kotlin/Flattener.kt Normal file
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class Flattener {
companion object {
fun flatten(inpList: List<Any?>): List<Any?> {
val returnList: MutableList<Any?> = mutableListOf()
for (i in inpList){
if (i is List<*>){
returnList.addAll(flatten(i))
}
else returnList.add(i)
}
return returnList.filter { it != null }
}
}
}

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kotlin/flatten-array/src/test/kotlin/FlattenerTest.kt Normal file
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import org.junit.Test
import org.junit.Ignore
import kotlin.test.assertEquals
class FlattenerTest {
@Test
fun flattensANestedList() {
val nestedList = listOf<Any>(emptyList<Any>())
assertEquals(emptyList<Any>(), Flattener.flatten(nestedList))
}
@Test
fun flattens2LevelNestedList() {
val nestedList = listOf(1, listOf(2, 3, 4), 5)
assertEquals(listOf(1, 2, 3, 4, 5), Flattener.flatten(nestedList))
}
@Test
fun flattens3LevelNestedList() {
val nestedList = listOf(1, listOf(2, 3, 4), 5, listOf(6, listOf(7, 8)))
assertEquals(listOf(1, 2, 3, 4, 5, 6, 7, 8), Flattener.flatten(nestedList))
}
@Test
fun flattens5LevelNestedList() {
val nestedList = listOf(0, 2, listOf(listOf(2, 3), 8, 100, 4, listOf(listOf(listOf(50))), -2))
assertEquals(listOf(0, 2, 2, 3, 8, 100, 4, 50, -2), Flattener.flatten(nestedList))
}
@Test
fun flattens6LevelNestedList() {
val nestedList = listOf(1, listOf(2, listOf(listOf(3)), listOf(4, listOf(listOf(5))), 6, 7), 8)
assertEquals(listOf(1, 2, 3, 4, 5, 6, 7, 8), Flattener.flatten(nestedList))
}
@Test
fun flattens6LevelNestedListWithNulls() {
val nestedList = listOf(1, listOf(2, null, listOf(listOf(3), null), listOf(4, listOf(listOf(5))), 6, 7, listOf(listOf(null))), 8, null)
assertEquals(listOf(1, 2, 3, 4, 5, 6, 7, 8), Flattener.flatten(nestedList))
}
@Test
fun allNullNestedListReturnsEmptyList() {
val nestedList = listOf(null, listOf(null, listOf(null), listOf(listOf(listOf(null)))), null)
assertEquals(emptyList<Any>(), Flattener.flatten(nestedList))
}
}