fix: insertMany

packages/ecs/src/component/base.js

@@ -61,6 +61,20 @@ export default class BaseComponent {
     }
   }
 
+  insertMany(entities) {
+    const creating = [];
+    for (let i = 0; i < entities.length; i++) {
+      const [entity, values] = entities[i];
+      if (!this.getUnsafe(entity)) {
+        creating.push([entity, values]);
+      }
+      else {
+        this.set(entity, values);
+      }
+    }
+    this.createMany(creating);
+  }
+
   set(entity, values) {
     const instance = this.getUnsafe(entity);
     for (const i in values) {

packages/ecs/src/ecs.js

@@ -292,19 +292,13 @@ export default class Ecs {
     for (const i in components) {
       const entities = components[i];
       for (let j = 0; j < entities.length; ++j) {
-        let entity;
-        if (Array.isArray(entities[j])) {
-          [entity] = entities[j];
-        }
-        else {
-          entity = entities[j];
-        }
+        const [entity] = entities[j];
         if (!this.$$entities[entity].includes(i)) {
           this.$$entities[entity].push(i);
         }
         unique.add(entity);
       }
-      this.Components[i].createMany(entities);
+      this.Components[i].insertMany(entities);
     }
     const uniqueArray = Array.from(unique.values());
     for (let i = 0; i < this.$$systems.length; i++) {

packages/ecs/test/ecs.js

@@ -20,6 +20,17 @@ it('can create entities with components', () => {
     .to.deep.equal(JSON.stringify({Empty: {}, Position: {x: 32, y: 420, z: 0}}));
 });
 
+it('can insert components into entities', () => {
+  const ecs = new Ecs({Empty, Position});
+  const entity = ecs.create({Empty: {}});
+  ecs.insert(entity, {Position: {y: 420}});
+  expect(JSON.stringify(ecs.get(entity)))
+    .to.deep.equal(JSON.stringify({Empty: {}, Position: {x: 32, y: 420, z: 0}}));
+  ecs.insert(entity, {Position: {y: 69}});
+  expect(JSON.stringify(ecs.get(entity)))
+    .to.deep.equal(JSON.stringify({Empty: {}, Position: {x: 32, y: 69, z: 0}}));
+});
+
 it('can tick systems', () => {
   const Momentum = {
     x: 'int32',