STORE KEYS OF - IN statement stores all the keys of a MAP into another MAP. Say you have a MAP with keys
"dog". The elements these keys point to are not important. Using the
STORE KEYS OF statement, you can copy the keys of this MAP to another MAP as elements. Thus, the resulting MAP will (for example) have the value
0 at key 0, the value
"cat" at key 1 and the value
"dog" at key 2 (the order is not relevant and no ordering criteria is provided). This statement is thus used to find all the keys of a particular MAP.
STORE KEYS OF <MAP> IN <TEXT-MAP>
DATA:foo IS TEXT MAPbar IS TEXT MAPPROCEDURE:STORE "Hello there!" IN foo:0STORE "How are you?" IN foo:7STORE "I like cats" IN foo:"cat"STORE "I love dogs" IN foo:"dog"STORE "LDPL is nice" IN foo:3STORE KEYS OF foo IN bar
At the end of the execution of the previous excerpt of code, the
TEXT MAP called
bar will contain the values
"3" at keys that are consecutive integers starting at zero, but in no particular order (meaning that
"0" may come before
"7" or after it, no ordering criteria is provided by this standard).