diff --git a/JavaScript/4-improved.js b/JavaScript/4-improved.js
index 20a016e..aa45b0f 100644
--- a/JavaScript/4-improved.js
+++ b/JavaScript/4-improved.js
@@ -1,7 +1,13 @@
'use strict';
const poolify = (factory, { size, max }) => {
- const instances = new Array(size).fill(null).map(factory);
+ // It seems that preallocated array with defined size
+ // and using c-like for-loop will be more efficient in terms of V8 optimisation than
+ // const instances = new Array(size).fill(null).map(factory);
+ const instances = new Array(size);
+ for(let i = 0; i < size; i++){
+ instances[i] = factory();
+ }
const acquire = () => instances.pop() || factory();
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