Map Has Key Property

If the key that we are looking for is in the first entry in the map, then the map has the key. More formally:

map [ entry key: value, remaining ] contains key key = True

Examples

map [ entry "TX": "Texas", [ entry "FL": "Florida", [ entry "AZ": "Arizona", [ ] ] ] ] contains key "TX" = True

map [ entry "EST": "Eastern Time", [ entry "PST": "Pacific Time", [ ] ] ] contains key "EST" = True

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