Initial data commit

Task/Singly-linked-list-Element-insertion/Jq/singly-linked-list-element-insertion-1.jq

@@ -0,0 +1,13 @@
+ def new($item; $next):
+  if $next | (.==null or is_singly_linked_list)
+  then {$item, $next}
+  else "new(_;_) called with invalid SLL: \($next)" | error
+  end;
+
+# A constructor:
+def new($x): new($x; null);
+
+def insert($x):
+  if is_empty_singly_linked_list then {item: $x, next: null}
+  else .next |= new($x; .)
+  end;

Task/Singly-linked-list-Element-insertion/Jq/singly-linked-list-element-insertion-2.jq

@@ -0,0 +1 @@
+new(1) | insert(2)