Benchmark: foreach vs objects

Tests:

1
const abcd = []; const a = { name: 'name 1', income: 123, gap: 500, gapProportion: 0.2 }; const b = { name: 'name 1', income: 123, gap: 500, gapProportion: 0.2 }; const c = { name: 'name 1', income: 123, gap: 500, gapProportion: 0.2 }; const d = { name: 'name 1', income: 123, gap: 500, gapProportion: 0.2 }; abcd.push(a); abcd.push(b); abcd.push(c); abcd.push(d);
2
const abcd = []; const x = [{ name: 'name 1', income: 123, gap: 500, gapProportion: 0.2 }, { name: 'name 1', income: 123, gap: 500, gapProportion: 0.2 }, { name: 'name 1', income: 123, gap: 500, gapProportion: 0.2 }, { name: 'name 1', income: 123, gap: 500, gapProportion: 0.2 }]; x.forEach(el => abcd.push(el));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser/OS: Chrome 123 on Linux

View result in a separate tab

Test name	Executions per second
1	20361944.0 Ops/sec
2	19219984.0 Ops/sec

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

LLMs can make mistakes. Check important info.

The provided JSON represents two test cases for measuring the performance difference between using traditional `forEach` loops and objects in JavaScript.

**What is being tested:**

In both test cases, an array `abcd` is created and populated with four objects (`a`, `b`, `c`, and `d`). The test case then uses either a traditional `forEach` loop or object iteration to push each of these objects into the `abcd` array.

**Options compared:**

Two options are being compared:

1. **Traditional `forEach` loop:** This approach involves using a `for...of` loop with an iterable (in this case, the `abcd` array) and iterating over its elements using a callback function (`el => abcd.push(el)`).
2. **Object iteration:** This approach uses object iteration syntax (e.g., `x.forEach`) to iterate over the objects in the `x` array.

**Pros and Cons:**

* **Traditional `forEach` loop:**
	+ Pros:
		- More explicit control over iteration logic
		- Easier to handle edge cases or errors
	+ Cons:
		- May be slower due to the overhead of the callback function
		- Can lead to code duplication if not optimized correctly
* **Object iteration:**
	+ Pros:
		- Cleaner and more concise syntax
		- Less chance of errors, as it's a built-in feature
	+ Cons:
		- May be slower due to the overhead of object iteration
		- Limited control over iteration logic

**Library/Language features:**

Neither of these approaches uses any external libraries or JavaScript features. However, `forEach` loop is a built-in language feature in many modern JavaScript engines.

**Special JS feature/Syntax:**

None of the tested approaches utilizes any special JavaScript features or syntax beyond what's available by default (e.g., arrow functions, template literals).

**Alternatives:**

Other alternatives for this type of benchmarking include:

1. **Using `for...of` loop:** Instead of using traditional `forEach`, you could use a `for...of` loop to iterate over the array elements.
2. **Using `Array.prototype.map()` or `Array.prototype.reduce():** These methods can be used to transform arrays, but may not provide the same performance characteristics as direct iteration.

It's worth noting that modern JavaScript engines often provide optimizations for built-in features like `forEach`, so the actual performance differences between these approaches may vary depending on the engine and implementation.

Related benchmarks:

foreach vs objects (version: 0)

foreach

Comparing performance of: 1 vs 2

Created: one year ago by: Guest

Jump to the latest result

1

2

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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