Benchmark: Object assign - MeasureThat.net

Script Preparation code:

function generateObject() {
  var MAX_PROPERTIES = 150;
  var ALLOWED_CHARACTERS_IN_KEY = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_";
  var MAX_KEY_LENGTH = 30;

  var object = {};
  var propertiesCount = Math.round(Math.random() * MAX_PROPERTIES + 150);
  for(var i = 0 ; i < propertiesCount ; i++) {
      var keyLength = Math.round(Math.random() * MAX_KEY_LENGTH);
      var randKey = "";
      for(var j = 0 ; j < keyLength ; j++) {
          randKey += ALLOWED_CHARACTERS_IN_KEY[Math.floor(Math.random() * ALLOWED_CHARACTERS_IN_KEY.length)];
      }

      var randValue = Math.random();
      object[randKey] = randValue;
  }
  return object;
}

var obj1 = generateObject();
var obj2 = generateObject();
var obj3 = generateObject();
var obj4 = generateObject();

Tests:

Object assign nested
const result = Object.assign(Object.assign(Object.assign(Object.assign({} , obj1) , obj1) , obj1) , obj1)
Object assign one
const result = Object.assign({}, obj1, obj1, obj1 , obj1)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object assign nested
Object assign one

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark JSON and explain what's being tested, compared, and other considerations.

**Benchmark Definition**

The benchmark is defined in two parts:

1. **Script Preparation Code**: This code generates a JavaScript object with a varying number of properties (between 150 and 300) and random keys up to 30 characters long. The script also creates four objects (`obj1`, `obj2`, `obj3`, `obj4`) using this generated data.
2. **Html Preparation Code**: There is no HTML preparation code provided, which means the benchmark focuses solely on the JavaScript performance.

**Individual Test Cases**

There are two test cases:

1. **Object assign nested**: This test case uses a recursive call to `Object.assign()` with four objects (`obj1`, `obj2`, `obj3`, and `obj4`). The resulting object is stored in the `result` variable.
2. **Object assign one**: This test case uses a simple chain of three calls to `Object.assign()` with three copies of the same object (`obj1`) as arguments.

**Libraries Used**

None, this benchmark only relies on built-in JavaScript functions and variables.

**Special JS Features or Syntax**

There are no special features or syntax used in these benchmarks that would require specific knowledge to understand. The focus is solely on the performance comparison of `Object.assign()` with different numbers of nested calls.

**Options Compared**

The two test cases compare the following options:

* **Nested vs. Single Call**: Test case "Object assign nested" uses a recursive call with four levels of nesting, while "Object assign one" uses three consecutive single calls.
* **Number of Calls**: Both test cases use the same objects (`obj1`, `obj2`, `obj3`, and `obj4`) but differ in the number of calls to `Object.assign()`.

**Pros and Cons of Different Approaches**

**Nested Calls (Test case "Object assign nested")**

Pros:

* May be more efficient due to fewer function calls
* Can potentially avoid unnecessary assignments

Cons:

* Recursive calls can lead to stack overflows for large datasets
* Can result in slower performance due to the overhead of recursive function calls

**Single Calls (Test case "Object assign one")**

Pros:

* Fewer function calls, potentially reducing overhead
* Simple and straightforward implementation

Cons:

* May result in more assignments, which can be slower due to object property lookups
* Can lead to slower performance if the number of copies is large

**Other Considerations**

When interpreting benchmark results, it's essential to consider factors such as:

* **Data size**: Larger datasets may favor nested calls or single calls depending on implementation.
* **Browser and System Performance**: Different browsers and systems may have varying performance characteristics that affect benchmark results.
* **Optimization Techniques**: Optimizations like caching, memoization, or using specific browser features can influence benchmark outcomes.

**Alternatives**

Other alternatives for testing object assignment performance could include:

* Using a larger dataset with more properties or values
* Adding additional operations (e.g., sorting, filtering) to the test cases
* Comparing performance across different browsers or system configurations
* Exploring alternative libraries or implementations of `Object.assign()`, such as using `Array.prototype.reduce()`

Related benchmarks:

Object assign (version: 1)

Comparing performance of: Object assign nested vs Object assign one

Created: 2 years ago by: Registered User

Jump to the latest result

Object assign nested

Object assign one

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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