solution of #489

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## 0.22.5
 
+* `Common`:
+  * Add extension `withReplacedAt`/`withReplaced` ([#489](https://github.com/InsanusMokrassar/MicroUtils/issues/489))
 * `Coroutines`:
   * Add extension `Flow.debouncedBy`
 

common/src/commonMain/kotlin/dev/inmo/micro_utils/common/WithReplaced.kt

@@ -0,0 +1,5 @@
+package dev.inmo.micro_utils.common
+
+fun <T> Iterable<T>.withReplacedAt(i: Int, block: (T) -> T): List<T> = take(i) + block(elementAt(i)) + drop(i + 1)
+fun <T> Iterable<T>.withReplaced(t: T, block: (T) -> T): List<T> = withReplacedAt(indexOf(t), block)
+

common/src/commonTest/kotlin/dev/inmo/micro_utils/common/WithReplacedTest.kt

@@ -0,0 +1,21 @@
+package dev.inmo.micro_utils.common
+
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class WithReplacedTest {
+    @Test
+    fun testReplaced() {
+        val data = 0 until 10
+        val testData = Int.MAX_VALUE
+
+        for (i in 0 until data.last) {
+            val withReplaced = data.withReplacedAt(i) {
+                testData
+            }
+            val dataAsMutableList = data.toMutableList()
+            dataAsMutableList[i] = testData
+            assertEquals(withReplaced, dataAsMutableList.toList())
+        }
+    }
+}