Add identity

Author: JavierSegoviaCordoba

CHANGELOG.md

@@ -4,6 +4,8 @@
 
 ### Added
 
+- `identity` function
+
 ### Changed
 
 ### Deprecated

kotlin-stdlib/common/main/kotlin/com/javiersc/kotlin/stdlib/Identity.kt

@@ -0,0 +1,3 @@
+package com.javiersc.kotlin.stdlib
+
+public inline fun <A> identity(a: A): A = a

kotlin-stdlib/common/test/kotlin/com/javiersc/kotlin/stdlib/IdentityTest.kt

@@ -0,0 +1,18 @@
+package com.javiersc.kotlin.stdlib
+
+import kotlin.test.Test
+import kotlin.test.assertTrue
+
+class IdentityTest {
+
+    @Test
+    fun identity_should_return_the_same_value() {
+        val value1 = 1
+        val result1: Int = identity(value1)
+        assertTrue { value1 == result1 }
+
+        val valueA = 'A'
+        val resultA: Char = identity(valueA)
+        assertTrue { valueA == resultA }
+    }
+}