When {object} is a |List| or a |Blob| insert {item} at the start of it. If {idx} is specified insert {item} before the item with index {idx}. If {idx} is zero it goes before the first item, just like omitting {idx}. A negative {idx} is also possible, see |list-index|. -1 inserts just before the last item. Returns the resulting |List| or |Blob|. Examples: :let mylist = insert([2, 3, 5], 1) :call insert(mylist, 4, -1) :call insert(mylist, 6, len(mylist)) The last example can be done simpler with |add()|. Note that when {item} is a |List| it is inserted as a single item. Use |extend()| to concatenate |Lists|. Can also be used as a |method|: mylist->insert(item)