Benchmark: (many keys fixed) hasOwnPropery vs Loop vs if ... in vs Object.entries

Script Preparation code:

const keysLength = 100 * 1000;
var value = {}
for (let i = 0; i < keysLength; i++) {
    if (i === 50 * 1000) {
        value.name = 'Mark'
    }
    value[i] = i
}

Tests:

hasOwnPropery
value.hasOwnProperty('name');
Loop
for (const key in value) { if (key === 'name') break; }
if ... in
if ('name' in value) { }
Object.entries
Object.entries(value).find(x => x[0] === 'name')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
hasOwnPropery
Loop
if ... in
Object.entries

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Windows

View result in a separate tab

if ... in

34.8M/s

hasOwnPropery

32.8M/s

Loop

345/s

Object.entries

109/s

View exact numbers

Test name	Executions per second
✓ if ... in	34,825,204 Ops/sec
hasOwnPropery	32,806,432 Ops/sec
Loop	345 Ops/sec
Object.entries	109 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition JSON**

The provided JSON represents a benchmark definition for multiple test cases. Here's what's tested:

* The `hasOwnProperty` vs `Loop` vs `if ... in` vs `Object.entries` comparison is being evaluated for its performance.
* The script preparation code creates an object with 100,000 properties and sets one property to `'name'` at a specific iteration (`50,000` iterations).

**Options Compared**

The four options compared are:

1. **hasOwnProperty**: Uses the `in` operator to check if a property exists in an object.
2. **Loop**: Iterates through the object's properties using a traditional loop.
3. **if ... in**: Combines an `if` statement with the `in` operator to check for property existence.
4. **Object.entries**: Uses the `Object.entries()` method to iterate over an object's key-value pairs.

**Pros and Cons of Each Approach**

Here's a brief summary:

* **hasOwnProperty**: Pros: Simple, efficient; Cons: May be slower than other methods due to caching or branching overhead.
* **Loop**: Pros: Control over iteration order; Cons: Can be slower for large objects due to unnecessary iterations.
* **if ... in**: Pros: Combines conditional checking with property existence; Cons: May have branching overhead, affecting performance.
* **Object.entries**: Pros: Modern and efficient way to iterate over objects; Cons: May not be as familiar to older developers.

**Library and Syntax Used**

In this benchmark, the `in` operator is used extensively. The `hasOwnProperty` option uses this operator directly. The `if ... in` approach also leverages this operator.

No special JavaScript features or syntax are mentioned in the benchmark definition.

**Other Considerations**

When writing benchmarks like these, it's essential to consider factors such as:

* **Object size**: Increasing the object size can reveal performance differences between methods.
* **Browser and engine variations**: Different browsers and engines may have varying optimizations for each method.
* **Caching and memoization**: Some methods, like `hasOwnProperty`, might benefit from caching or memoization.

**Alternatives**

For similar benchmarking purposes, you could consider using:

1. micro-benchmarking libraries like `Benchmark.js` or `js-benchmark`.
2. Online platforms like `jsperf` (now defunct) or `jsbench`.

Keep in mind that the choice of benchmarking library or platform depends on your specific needs and goals.

Hope this explanation helps!

(many keys fixed) hasOwnPropery vs Loop vs if ... in vs Object.entries (version: 1)

Comparing performance of: `hasOwnPropery vs Loop vs if ... in vs Object.entries`

Created: 2 years ago by: Registered User

Go to the latest result

hasOwnPropery

Loop

if ... in

Object.entries

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

(many keys fixed) hasOwnPropery vs Loop vs if ... in vs Object.entries (version: 1)

Comparing performance of: hasOwnPropery vs Loop vs if ... in vs Object.entries

Created: 2 years ago by: Registered User

Go to the latest result

hasOwnPropery

Loop

if ... in

Object.entries

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `hasOwnPropery vs Loop vs if ... in vs Object.entries`