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src/utils/ChangeList.ts

@@ -0,0 +1,24 @@
+export class ChangeList<T>{
+    private set = new Set<T>;
+
+    public get changeCount() {
+        return this.set.size;
+    }
+
+    public get hasChanges() {
+        return this.changeCount > 0;
+    }
+
+    public handleChange(item: T) {
+        if (!this.set.delete(item))
+            this.set.add(item);
+    }
+
+    public getChanges() {
+        return this.set.values();
+    }
+
+    public map<R>(mapper: (v: T, idx: number, arr: T[]) => R): R[] {
+        return [...this.getChanges()].map(mapper);
+    }
+}