Benchmark: For vs Foreach - MeasureThat.net

Script Preparation code:

var test = [
    { name: 'John', age: 75 },
    { name: 'Mike',    age: 85 },
    { name: 'Jane',   age: 95 },
    { name: 'June', age: 65 },
    { name: 'Mick',       age: 55 }
];

Tests:

for javascript
for (var i = 0; i < test.length; i++) { console.log(test[i]); }
foreach javascript
test.forEach(function(test, index) { console.log(test); });
foreach jquery
$.each(test, function(index, test ) { console.log(test) })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for javascript
foreach javascript
foreach jquery

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.79 Safari/537.36

Browser/OS: Chrome 61 on Linux

View result in a separate tab

Test name	Executions per second
for javascript	21138.4 Ops/sec
foreach javascript	23094.6 Ops/sec
foreach jquery	15203.4 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):

LLMs can make mistakes. Check important info.

Let's break down what is being tested on the provided JSON and explain the differences between various approaches.

**Benchmark Definition**

The benchmark definition defines two test cases: `for javascript` and `foreach javascript`. The script preparation code for both tests uses an array of objects (`test`) with a specific structure (name and age).

**Options Compared**

There are three options compared:

1. **For loop**: `var i = 0; while(i < test.length) { console.log(test[i]); i++; }`
2. **Foreach loop (JavaScript)**: `for (var i = 0; i < test.length; i++) { console.log(test[i]); }` (Note: JavaScript's `foreach` is not a built-in feature, but rather the `forEach()` method, which is similar in syntax)
3. **Foreach loop (jQuery)**: `$().each(function(index, value) { console.log(value); })`

**Pros and Cons of Each Approach**

1. **For loop**:
	* Pros: More explicit control over iteration, can be more efficient in some cases.
	* Cons: May require more code to handle edge cases, such as checking the length of the array before iterating.
2. **Foreach loop (JavaScript)**:
	* Pros: Concise syntax, easy to read and maintain, works well with JavaScript's built-in data structures.
	* Cons: Can be slower than a traditional `for` loop due to the overhead of calling the `forEach()` method.
3. **Foreach loop (jQuery)**:
	* Pros: Convenient syntax for iterating over collections, leverages jQuery's powerful DOM manipulation capabilities.
	* Cons: Requires including jQuery library, can add unnecessary overhead depending on the size and complexity of the data structure.

**Library**

In this benchmark, jQuery is used as a third-party library to provide additional functionality beyond vanilla JavaScript. The `$.each()` method allows for easy iteration over collections, but also introduces an extra layer of complexity due to the need to include the jQuery library.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntax being tested in this benchmark. However, it's worth noting that modern browsers often have performance optimizations and caching mechanisms that can affect the performance of loops like these.

**Other Alternatives**

Some other alternatives for iterating over arrays or collections include:

* Vanilla `forEach()` method (JavaScript)
* Array.prototype.map(), filter(), reduce() methods (JavaScript)
* Lodash library's `forEach`, map, filter, reduce` functions (alternative to jQuery)

Overall, the choice of iteration method depends on the specific use case, personal preference, and performance requirements. The benchmark helps to evaluate which approach is most efficient in this particular scenario.

Related benchmarks:

For vs Foreach (version: 0)

Testing performance

Comparing performance of: for javascript vs foreach javascript vs foreach jquery

Created: 7 years ago by: Guest

Jump to the latest result

for javascript

foreach javascript

foreach jquery

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):