perf(jslib): add `attr` cache

tools/upend_js/index.ts

@@ -66,26 +66,31 @@ export class UpObject {
     );
   }
 
+  private _attr: { [key: string]: UpEntry[] } | undefined;
+
   public get attr() {
-    const result = {} as { [key: string]: UpEntry[] };
-    this.attributes.forEach((entry) => {
-      if (!result[entry.attribute]) {
-        result[entry.attribute] = [];
-      }
+    if (!this._attr) {
+      const result = {} as { [key: string]: UpEntry[] };
+      this.attributes.forEach((entry) => {
+        if (!result[entry.attribute]) {
+          result[entry.attribute] = [];
+        }
 
-      result[entry.attribute].push(entry);
-    });
+        result[entry.attribute].push(entry);
+      });
 
-    this.backlinks.forEach((entry) => {
-      const attribute = `~${entry.attribute}`;
-      if (!result[attribute]) {
-        result[attribute] = [];
-      }
+      this.backlinks.forEach((entry) => {
+        const attribute = `~${entry.attribute}`;
+        if (!result[attribute]) {
+          result[attribute] = [];
+        }
 
-      result[attribute].push(entry);
-    });
+        result[attribute].push(entry);
+      });
 
-    return result;
+      this._attr = result;
+    }
+    return this._attr;
   }
 
   public get(attr: string) {

tools/upend_js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@upnd/upend",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "description": "Client library to interact with the UpEnd system.",
   "scripts": {
     "build": "tsc --build --verbose",