Added itemForKey

Author: perki

docs/hds-lib.js

@@ -28,8 +28,37 @@ class HDSModel {
     const response = await fetch(this.#modelUrl);
     const resultText = await response.text();
     const result = JSON.parse(resultText);
-    this.#modelData = result;
+    this.#modelData = deepFreeze(result);
+  }
+
+  /**
+   * get item for a key
+   * @param {string} key
+   */
+  itemForKey (key) {
+    return this.#modelData.items[key];
   }
 }
 
 module.exports = HDSModel;
+
+/**
+ * Recursively make immutable an object
+ * @param {*} object
+ * @returns {*}
+ */
+function deepFreeze (object) {
+  // Retrieve the property names defined on object
+  const propNames = Reflect.ownKeys(object);
+
+  // Freeze properties before freezing self
+  for (const name of propNames) {
+    const value = object[name];
+
+    if ((value && typeof value === 'object') || typeof value === 'function') {
+      deepFreeze(value);
+    }
+  }
+
+  return Object.freeze(object);
+}

docs/hds-lib.js.map

@@ -1,4 +1,5 @@
 /* eslint-env mocha */
+const assert = require('node:assert/strict');
 
 const modelURL = 'https://model.datasafe.dev/pack.json';
 
@@ -8,5 +9,7 @@ describe('[MODX] Model', () => {
   it('[MODL] Load model', async () => {
     const model = new HDSModel(modelURL);
     await model.load();
+    const item = model.itemForKey('body-weight');
+    assert.equal(item.streamId, 'body-weight');
   });
 });