Return all the key names of an Associative Array
String_Type[] assoc_get_keys (Assoc_Type a)
This function returns all the key names of an associative array a as an ordinary one dimensional array of strings. If the associative array contains no keys, an empty array will be returned.
The following function computes the number of keys in an associative array:
define get_num_elements (a) { return length (assoc_get_keys (a)); }
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