Extend quick blog post with from() round-trip and toResource() output

Author: ryukzak

docs/posts/typescript-profiles-quick.md

@@ -9,7 +9,6 @@ import { observation_bpProfile } from "./profiles/Observation_observation_bp";
 
 const bp = observation_bpProfile.create({
     status: "final",
-    category: [],
     subject: { reference: "Patient/pt-1" },
 });
 
@@ -22,21 +21,32 @@ bp.setVscat({ text: "Vital Signs" })
 // Validate against profile constraints
 bp.validate(); // [] -- valid
 
-// Get plain FHIR JSON
+// Get plain FHIR JSON -- ready for API calls, storage, etc.
 const obs = bp.toResource();
 // {
-//     resourceType: "Observation",
-//     meta: { profile: ["http://hl7.org/fhir/StructureDefinition/bp"] },
-//     status: "final",
-//     code: { coding: [{ code: "85354-9", system: "http://loinc.org" }] },
-//     category: [{ text: "Vital Signs", coding: { code: "vital-signs", system: "http://terminology.hl7.org/CodeSystem/observation-category" } }],
-//     subject: { reference: "Patient/pt-1" },
-//     effectiveDateTime: "2024-06-15",
-//     component: [
-//         { code: { coding: { code: "8480-6", system: "http://loinc.org" } }, valueQuantity: { value: 120, unit: "mmHg" } },
-//         { code: { coding: { code: "8462-4", system: "http://loinc.org" } }, valueQuantity: { value: 80, unit: "mmHg" } },
-//     ],
+//   resourceType: "Observation",
+//   meta: { profile: ["http://hl7.org/fhir/StructureDefinition/bp"] },
+//   status: "final",
+//   code: { coding: [{ code: "85354-9", system: "http://loinc.org" }] },
+//   category: [{ coding: [{ code: "vital-signs", system: "http://...observation-category" }] }],
+//   subject: { reference: "Patient/pt-1" },
+//   effectiveDateTime: "2024-06-15",
+//   component: [
+//     { code: { coding: [{ code: "8480-6", system: "http://loinc.org" }] }, valueQuantity: { value: 120, unit: "mmHg" } },
+//     { code: { coding: [{ code: "8462-4", system: "http://loinc.org" }] }, valueQuantity: { value: 80, unit: "mmHg" } },
+//   ],
 // }
+
+// Wrap any Observation back into a profile to read slices
+const bp2 = observation_bpProfile.from(obs);
+
+bp2.getSystolicBp();    // { valueQuantity: { value: 120, unit: "mmHg" } }
+bp2.getDiastolicBp();   // { valueQuantity: { value: 80, unit: "mmHg" } }
+bp2.getVscat();         // { text: "Vital Signs" }
+bp2.getEffectiveDateTime(); // "2024-06-15"
+
+// Raw getters return the full FHIR element including discriminator values
+bp2.getSystolicBpRaw(); // { code: { coding: [{ code: "8480-6", ... }] }, valueQuantity: { value: 120, ... } }
 ```
 
 Supports resource profiles, simple/complex extension profiles, slice accessors, choice types, and `validate()` checking required fields, fixed values, slice cardinality, enum bindings, and reference types.