On a list, inserts an item in that list. index is the index where the item will be inserted. The first item has an index of 0. (The 6th item in a list would have an index of 5.)
Likewise for a string, but all characters in a multiple-character string2 are inserted at index.
show insert-item 2 [2 7 4 5] 15 => [2 7 15 4 5] show insert-item 2 "cat" "re" => "caret"
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