(datanames: datamap) → array

This takes a datamap, and returns a sorted array of its data names, sorted alphabetically.

Example usage:

(datanames: (dm:'B','Y', 'A','X')) produces the array (a: 'A','B')

Rationale:

Sometimes, you may wish to obtain some information about a datamap. You may want to list all of its data names, or determine how many entries it has. You can use the (datanames:) macro to do these things: if you give it a datamap, it produces a sorted array of all of its names. You can then (print:) them, check the length of the array, obtain a subarray, and other things you can do to arrays.

See also:

(datavalues:), (dataentries:)