Added hasAny to Entity

package.json

@@ -1,6 +1,6 @@
 {
   "name": "picoes",
-  "version": "1.0.0-alpha3",
+  "version": "1.0.0-alpha4",
   "description": "Pico Entity System for JavaScript (ES6).",
   "main": "./index.js",
   "scripts": {

src/entity.js

@@ -63,6 +63,21 @@ class Entity {
 		return components.every(name => name in this.data)
 	}
 
+	/**
+	 * Returns true if the entity has ANY of the specified component names.
+	 * If no component names are specified, this method returns false.
+	 *
+	 * @example
+	 * if (entity.hasAny('position', 'velocity')) {...}
+	 *
+	 * @param {...string} [components] - The component names to check for
+	 *
+	 * @return {boolean} true or false
+	 */
+	hasAny(...components) {
+		return components.some(name => name in this.data)
+	}
+
 	/**
 	 * Returns a component by name, or undefined if it doesn't exist
 	 *

src/entity.test.js

@@ -79,35 +79,42 @@ test('entity: get and set components', testIndexers(world => {
 	let ent = world.entity()
 	ent.set('position', 5)
 	assert(ent.has('position'))
+	assert(ent.hasAny('position'))
 	assert(ent.components.length == 1)
 	assert(ent.get('position').x === 5)
 	assert(ent.get('position').y === 0)
 
 	ent.update('position', {y: 3})
 	assert(ent.has('position'))
+	assert(ent.hasAny('position'))
 	assert(ent.components.length == 1)
 	assert(ent.get('position').x === 5)
 	assert(ent.get('position').y === 3)
 
 	ent.update('object', {val: 50})
 	assert(ent.has('object'))
+	assert(ent.hasAny('object'))
 	assert(ent.components.length == 2)
 	assert(ent.get('object').val === 50)
 
 	ent.update('empty', {testing: 100})
 	assert(ent.has('empty'))
+	assert(ent.hasAny('empty'))
 	assert(ent.components.length == 3)
 	assert(ent.get('empty').testing === 100)
 
 	ent.set('anonymous')
 	assert(ent.components.length == 4)
 	assert(ent.has('anonymous'))
+	assert(ent.hasAny('anonymous'))
 
 	// Access test
 	ent.removeAll()
 	assert(!ent.has('position'))
+	assert(!ent.hasAny('position'))
 	ent.access('position').x = 300
 	assert(ent.has('position'))
+	assert(ent.hasAny('position'))
 	assert(ent.get('position').x === 300)
 
 	// Get test
@@ -138,6 +145,39 @@ test('entity: get and set components', testIndexers(world => {
 	assert(ent.get('invalid2')[0] === 'test')
 }))
 
+test('entity: check existence of components', testIndexers(world => {
+	world.component('position', function(x = 0, y = 0) {
+		this.x = x
+		this.y = y
+	})
+	world.component('empty')
+	const ent = world.entity()
+	assert(!ent.hasAny())
+	assert(ent.has())
+	ent.set('a')
+	ent.set('b')
+	assert(ent.has())
+	assert(ent.has('a'))
+	assert(ent.has('a','b'))
+	assert(!ent.has('a','b','c','d'))
+	assert(!ent.hasAny())
+	assert(ent.hasAny('a'))
+	assert(ent.hasAny('a','b'))
+	assert(ent.hasAny('','a','c'))
+	assert(ent.hasAny('a','b','c','d'))
+
+	ent.removeAll()
+	assert(ent.has())
+	assert(!ent.has('a'))
+	assert(!ent.has('a','b'))
+	assert(!ent.has('a','b','c','d'))
+	assert(!ent.hasAny())
+	assert(!ent.hasAny('a'))
+	assert(!ent.hasAny('a','b'))
+	assert(!ent.hasAny('','a','c'))
+	assert(!ent.hasAny('a','b','c','d'))
+}))
+
 test('entity: setRaw', testIndexers(world => {
 	world.component('position', function(x = 0, y = 0) {
 		this.x = x