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for-in vs Object.entires
(version: 0)
Comparing performance of:
for-in vs Object.entires
Created:
2 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var obj = { 'a': 1, 'b': 1, 'c': 1, 'd': 1, 'e': 1, 'f': 1, 'g': 1 };
Tests:
for-in
for (var i=10000; i > 0; i--) { for (var key in obj) { console.log(key); } }
Object.entires
for (var i=10000; i > 0; i--) { Object.entries(obj).forEach(key => console.log(key)); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
for-in
Object.entires
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and its options. **Benchmark Overview** The benchmark is designed to compare the performance of two approaches: using a traditional `for` loop with the `in` operator (`for-in`) versus using the `Object.entries()` method. The test measures how many executions per second (i.e., how fast) each approach can process 10,000 iterations. **Options Compared** There are two options being compared: 1. **Traditional `for` loop with `in` operator**: This approach uses a manual incrementing counter (`i`) to iterate over the object's properties. The `in` operator is used to check if each property name exists in the object. 2. **`Object.entries()` method**: This approach uses the `Object.entries()` method, which returns an array of tuples containing the property names and values of the object. The `forEach` method is then used to iterate over this array. **Pros and Cons** 1. **Traditional `for` loop with `in` operator**: * Pros: Easy to understand, no extra library dependencies required. * Cons: May have performance issues due to repeated property name lookups. 2. **`Object.entries()` method**: * Pros: More efficient, as it avoids repeated property name lookups. * Cons: Requires knowledge of the `Object.entries()` method and its behavior. **Library and Syntax** In this benchmark, no external libraries are used. However, some syntax features are employed: 1. **`for-in` loop**: This is a built-in JavaScript syntax for iterating over an object's properties. 2. **`Object.entries()` method**: This is a standard method introduced in ECMAScript 2015 (ES6) for accessing an object's own property names and values as an array of key-value pairs. **Benchmark Preparation Code** The script preparation code defines the `obj` object with 11 properties, all initialized to 1. This allows the benchmark to focus on the iteration logic rather than the object's contents. **Individual Test Cases** There are two test cases: 1. **"for-in"**: This test case uses a traditional `for` loop with the `in` operator. 2. **"Object.entries"`: This test case uses the `Object.entries()` method to iterate over the object's properties. **Latest Benchmark Results** The results show that the "Object.entries" approach is slightly faster than the traditional "for-in" approach, which suggests that using the `Object.entries()` method can provide a performance benefit in this specific scenario.
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