diff -r 6d7aa8a1a3b3 -r f695ae118460 src/array.c
--- a/src/array.c	Thu Jul 04 22:23:15 2019 +0200
+++ b/src/array.c	Thu Jul 04 22:32:03 2019 +0200
@@ -143,6 +143,24 @@
     return 0;
 }
 
+int ucx_array_set(UcxArray *array, size_t index, void *data) {
+    if (index >= array->size) {
+        if (ucx_array_reserve(array, index+1)) {
+            return 1;
+        }
+        array->size = index+1;
+    }
+    
+    void *dest = ucx_array_at(*array, index);
+    if (data) {
+        memcpy(dest, data, array->elemsize);
+    } else {
+        memset(dest, 0, array->elemsize);
+    }
+    
+    return 0;
+}
+
 int ucx_array_concat(UcxArray *array1, const UcxArray *array2) {
     
     if (array1->elemsize != array2->elemsize)