#Resources

A resource is a json.Value. Read it with JSON pointers and change it with json.set, json.append and json.remove:

def family as string init json.asString($p, "/name/0/family");
$p = json.set($p, "/birthDate", "1980-02-14");
$p = json.append($p, "/identifier", fhir.identifier("urn:oid:1.2.3.4", "MRN-1001"));

The helpers cover what every resource has: resourceType, idOf, versionOf, referenceOf (Patient/123), and reference(type, id) to build one. identifierValue finds the value of an identifier in a system.

#Codes

$obs = json.set($obs, "/code", fhir.concept("http://loinc.org", "2345-7", "Glucose"));
if (fhir.hasCoding(json.get($obs, "/code"), "http://loinc.org", "2345-7")) {
    io.printf("a glucose observation\n");
}

#Bundles

resourcesOf gives the resources of any bundle's entries; bundle and entry build transactions and batches (see Writing).

#OperationOutcome

A server explains a failure with an OperationOutcome. The deck puts its diagnostics into the error message; issues reads one fully, such as the result of $validate:

for (def i in fhir.issues($outcome)) {
    io.printf("%s %s at %s: %s\n", $i.severity, $i.code,
        strings.join($i.expression, ", "), $i.diagnostics);
}