Object pool

tshemsedinov · tshemsedinov · commit 6edf98c26e48 · 2018-01-06T02:52:48.000+02:00
diff --git a/JavaScript/6-pool.js b/JavaScript/6-pool.js
@@ -0,0 +1,34 @@
+'use strict';
+
+const pool = (item) => {
+  pool.items = pool.items || new Array(10).fill(new Array(1000).fill(0));
+
+  if (item) {
+    pool.items.push(item);
+    console.log('Recycle item, count =', pool.items.length);
+    return;
+  }
+  const res = pool.items.pop() || new Array(1000).fill(0);
+
+  console.log('Get from pool, count =', pool.items.length);
+  return res;
+};
+
+// Usage
+
+const a1 = pool();
+const b1 = a1.map((x, i) => i).reduce((x, y) => x + y);
+console.log(b1);
+
+const a2 = pool();
+const b2 = a2.map((x, i) => i).reduce((x, y) => x + y);
+console.log(b2);
+
+pool(a1);
+pool(a2);
+
+const a3 = pool();
+const b3 = a3.map((x, i) => i).reduce((x, y) => x + y);
+console.log(b3);
+
+// See: https://github.com/HowProgrammingWorks/Pool
