Benchmark: For loop vs For...Of loop 3

Tests:

for loop
let operations = [{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},] for (let i=0; i< operations.length; i++) { if (operations[i].foo && operations[i].foo.bar) { operations[i].foo.bar = 'zulu'; console.log(operations[i].foo.bar); } }
for...of loop
let operations = [{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},{foo: {bar:'bar'}},] for (let value of operations) { if (value.foo && value.foo.bar) { value.foo.bar = 'zulu' console.log(value.foo.bar); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for loop
for...of loop

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**Benchmark Overview**

The benchmark is comparing two approaches to iterate over an array: traditional `for` loops and the newer `for...of` loop syntax.

**Options Compared**

1. **Traditional `for` loop**: This approach uses a manual index variable to iterate over the array elements.
```javascript
for (let i = 0; i < operations.length; i++) {
  // ...
}
```
2. **`for...of` loop**: This approach uses the iterator protocol to iterate over the array elements without manually managing an index variable.

**Pros and Cons**

**Traditional `for` Loop:**

Pros:

* Well-known and widely supported syntax
* Easy to understand for developers familiar with C-style loops

Cons:

* Requires manual management of the index variable, which can lead to errors or off-by-one issues
* May not be as efficient due to the overhead of incrementing the index variable

**`for...of` Loop:**

Pros:

* More concise and expressive syntax
* Eliminates the need for manual index management, reducing the risk of errors
* Often more efficient due to optimized iteration logic

Cons:

* Less widely supported or understood by older browsers or developers not familiar with the newer syntax

**Library Used (if any)**

In this benchmark, no specific library is used. However, if a library were involved, it might be used for additional functionality or optimizations.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntaxes mentioned in this benchmark. The focus is on the iteration mechanisms themselves.

**Other Alternatives**

If you'd like to explore alternative approaches, consider the following:

* **Array.prototype.forEach()**: This method provides a more concise way to iterate over arrays without manually managing an index variable.
```javascript
operations.forEach((value) => {
  // ...
});
```
* **Async iteration**: For large datasets or performance-critical applications, using async iteration libraries like `p-iterable` or `async-iterator` might provide additional optimizations.

Keep in mind that the choice of iteration mechanism ultimately depends on your specific use case, performance requirements, and personal preference.

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36

Browser/OS: Chrome 78 on Mac OS X 10.14.5

View result in a separate tab

Test name	Executions per second
for loop	1309.5 Ops/sec
for...of loop	1277.5 Ops/sec

Related benchmarks:

For loop vs For...Of loop 3 (version: 0)

Comparing performance of: for loop vs for...of loop

Created: 4 years ago by: Guest

Jump to the latest result

for loop

for...of loop

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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