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| operator | is keyed | ||||||||
Return type: Boolean Returns true if the item has a key, and false otherwise. Replacing
Returns: is with isnt will reverse the results.
Syntax
shelf-name indexer? (is | isnt) keyed
Tests whether the specified shelf item has a key associated with it.
If no item is specified, then the test looks at the default item. This form is primarily useful either within actions modified by the using prefix or in functions.
An error is produced if the specified item does not exist.
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