game: extract enemyBehaviors

game.js

@@ -78,16 +78,12 @@ let player = {
   },
 }
 
-/**
- * @typedef {'point' | 'fidget' | 'bounce' | 'zombie'} EnemyType
- */
-/** @type EnemyType[] */
 const enemyTypes = ['point', 'fidget', 'bounce', 'zombie']
 
 /**
  * @typedef {{
  *   letter: string,
- *   type: EnemyType,
+ *   type: keyof typeof enemyBehaviors,
  *   dangerZone: number,
  *   positions: Point[],
  * }} Enemy
@@ -221,7 +217,9 @@ function spawn() {
   const enemyCount = 1 + Math.floor(arena.wave / 2)
 
   const getType = (wave) => {
-    if (wave < 2) return 'point'
+    if (wave <= 2) return 'point'
+
+    const enemyTypes = Object.keys(enemyBehaviors)
     return enemyTypes[rnd(0, enemyTypes.length - 1)]
   }
 
@@ -258,25 +256,23 @@ function spawn() {
     effects.unshift({
       type: 'detection',
       to: enemy.positions[0],
-      frames: Array(5).fill(4),
+      frames: Array(10).fill(4),
     })
   })
 }
 
-function moveEnemies() {
+const enemyBehaviors = {
-  enemies.forEach((enemy) =>
-    ({
   point: () => {},
-      fidget: () => {},
+  fidget: (enemy) => {},
-      bounce: () => {
+  bounce: (enemy) => {
     const speed = 1
     const current = enemy.positions[0]
     const previous = enemy.positions[1]
 
-        let d = getDirection(previous, current)
+    const d = getDirection(previous, current)
 
-        dx = d.x * speed
+    let dx = d.x * speed
-        dy = d.y * speed
+    let dy = d.y * speed
 
     let newX = current.x + dx
     let newY = current.y + dy
@@ -296,7 +292,7 @@ function moveEnemies() {
       { x: current.x, y: current.y },
     ]
   },
-      zombie: () => {
+  zombie: (enemy) => {
     const speed = 0.5
     const current = enemy.positions[0]
     const target = player.position
@@ -310,8 +306,10 @@ function moveEnemies() {
       },
     ]
   },
-    })[enemy.type](),
+}
-  )
+
+function moveEnemies() {
+  enemies.forEach((enemy) => enemyBehaviors[enemy.type](enemy))
 }
 
 function checkColisions() {