Added hasComponent | Forgor about it

src/example/simple/component.zig

@@ -41,3 +41,5 @@ pub const Player = struct {
         try writer.print("\"{s}\"", .{self.name});
     }
 };
+
+pub const Dead = struct { value: bool = false };

src/example/simple/system.zig

@@ -153,7 +153,7 @@ pub fn test_ecs(
     ctx: App.scheduler.Context,
 ) !void {
     // --- SPAWN ENTITY ---
-    try ctx.app.world.spawn(.{
+    const player = try ctx.app.world.spawnEntity(.{
         component.Player{ .name = "abux" },
         component.Material{},
         component.Transform{},
@@ -204,4 +204,20 @@ pub fn test_ecs(
         );
         std.debug.print("\x1b[0m", .{});
     }
+
+    if (ctx.app.world.getComponent(component.Dead, player)) |_| {
+        std.debug.print("------------------>\n", .{});
+    }
+
+    // try ctx.app.world.addComponents(player, .{component.Dead{}});
+    try ctx.app.world.addComponents(player, .{
+        component.Dead{},
+    });
+
+    const cmps = try ctx.app.world.getComponents(struct {
+        mat: *component.Material,
+        dead: ?*component.Dead,
+    }, player);
+
+    if (cmps.dead) |_| {}
 }

src/world/world.zig

@@ -225,6 +225,16 @@ pub fn getComponents(
     return result;
 }
 
+/// ----------------------------------------------------
+/// ----------------------------------------------------
+pub fn hasComponent(
+    self: *Self,
+    comptime T: type,
+    entity: u64,
+) bool {
+    return self.getComponent(T, entity) != null;
+}
+
 /// ----------------------------------------------------
 /// ----------------------------------------------------
 pub fn despawn(