[KTLN-708] Add Samples (#762)

* [KTLN-708] Add Samples

* [KTLN-708] Add Samples

* [KTLN-708] Add Samples

* [KTLN-708] Add Samples

* Update core-kotlin-modules/core-kotlin-files/src/test/kotlin/com/baeldung/deletefile/DeleteFileUnitTest.kt

Co-authored-by: KevinGilmore <[email protected]>

* Update core-kotlin-modules/core-kotlin-files/src/test/kotlin/com/baeldung/deletefile/DeleteFileUnitTest.kt

---------

Co-authored-by: KevinGilmore <[email protected]>

Author: LeoColman

core-kotlin-modules/core-kotlin-files/src/main/kotlin/com/baeldung/deletefile/DeleteFile.kt

@@ -0,0 +1,40 @@
+package com.baeldung.deletefile
+
+import java.io.File
+import java.io.IOException
+
+fun deleteFile(filePath: String) {
+    val file = File(filePath)
+    if (file.exists() && file.isFile) {
+        file.delete()
+    }
+}
+
+fun deleteDirectory(directory: File) {
+    if (directory.exists() && directory.isDirectory) {
+        directory.listFiles()?.forEach { file ->
+            if (file.isDirectory) {
+                deleteDirectory(file)
+            } else {
+                file.delete()
+            }
+        }
+        directory.delete()
+    }
+}
+
+fun safeDeleteDirectory(directory: File) {
+    try {
+        deleteDirectory(directory)
+    } catch (e: IOException) {
+        e.printStackTrace()  // Or handle the exception as needed
+    }
+}
+
+fun File.deleteContentsRecursively(): Boolean {
+    if (!this.exists()) return false
+    if (!this.isDirectory) return this.delete()
+    return this.walkBottomUp().all { it.delete() }
+}
+
+val success = File("/path/to/directory").deleteRecursively()

core-kotlin-modules/core-kotlin-files/src/test/kotlin/com/baeldung/deletefile/DeleteFileUnitTest.kt

@@ -0,0 +1,57 @@
+package com.baeldung.deletefile
+
+import org.junit.jupiter.api.Assertions.*
+import org.junit.jupiter.api.Test
+import java.io.File
+
+class DeleteFileUnitTest {
+
+    @Test
+    fun `given file path when deleteFile called then file is deleted`() {
+        val tempFile = createTempFile()
+        assertTrue(tempFile.exists())
+
+        deleteFile(tempFile.absolutePath)
+
+        assertFalse(tempFile.exists())
+    }
+
+    @Test
+    fun `given directory when deleteDirectory called then directory and its contents are deleted`() {
+        val tempDir = createTempDir()
+        val tempFileInDir = File(tempDir, "tempFile.txt").apply { createNewFile() }
+        assertTrue(tempDir.exists())
+        assertTrue(tempFileInDir.exists())
+
+        deleteDirectory(tempDir)
+
+        assertFalse(tempDir.exists())
+        assertFalse(tempFileInDir.exists())
+    }
+
+    @Test
+    fun `given a non-existent file should not throw`() {
+        val file = File("imaginary-file.txt")
+
+        assertDoesNotThrow {
+            safeDeleteDirectory(file)
+        }
+    }
+
+    @Test
+    fun `given directory when deleteDirectory called then directory and its contents are deleted recursively`() {
+        val tempDir = createTempDir()
+        val innerTempDir = File(tempDir, "innerTempDir").apply { mkdir() }
+        val tempFileInDir = File(innerTempDir, "tempFile.txt").apply { createNewFile() }
+
+        assertTrue(tempDir.exists())
+        assertTrue(innerTempDir.exists())
+        assertTrue(tempFileInDir.exists())
+
+        tempDir.deleteContentsRecursively()
+
+        assertFalse(tempDir.exists())
+        assertFalse(innerTempDir.exists())
+        assertFalse(tempFileInDir.exists())
+    }
+}