Kotlin - Completed Pascal's Triangle

kotlin/pascals-triangle/src/main/kotlin/PascalsTriangle.kt

@@ -0,0 +1,27 @@
+class PascalsTriangle {
+    companion object {
+        fun computeTriangle(row: Int): List<List<Int>>{
+            require(row >= 0){}
+            val returnList = mutableListOf<MutableList<Int>>()
+            for (i in 0..row-1){
+                val tempList = mutableListOf<Int>()
+                for (j in 0..i){
+                    tempList.add(pascal(i,j))
+                }
+                returnList.add(tempList)
+            }
+            return returnList
+        }
+
+        private fun pascal(i: Int, j: Int): Int {
+            if (j == 0) {
+                return 1
+            } else if (j == i) {
+                return 1
+            } else {
+                return pascal(i - 1, j - 1) + pascal(i - 1, j)
+            }
+
+        }
+    }
+}