get_keys [function]

get_keys( iterable var )

returns an array of keys found in the iterable object var or returns null and emits a warning on failure

• var must be an iterable object (has interface OP_CONVERT defined and successfully handles a CONVOP_TOITER request) - such objects are array, dict, map and io_dir

get_keys( [5,7,0] ); // returns [0,1,2]
get_keys( {b=5,a=2} ); // returns ["b","a"]