Benchmark: Updating objects 2

Script Preparation code:

setC = v => o => ({
  a: o.a,
  b: o.b,
  c: v,
  d: o.d,
  e: o.e,
  f: o.f,
  g: o.g,
  h: o.h,
  i: o.i,
  j: o.j,
  k: o.k,
  l: o.l,
  m: o.m,
  n: o.n,
  o: o.o,
  p: o.p,
  q: o.q,
  r: o.r,
  s: o.s,
  t: o.t,
  u: o.u,
  v: o.v,
  w: o.w,
  x: o.x,
  y: o.y,
  z: o.z
})

o = {
  a: 1,
  b: 2,
  c: 3,
  d: 4,
  e: 5,
  f: 6,
  g: 7,
  h: 8,
  i: 9,
  j: 10,
  k: 11,
  l: 12,
  m: 13,
  n: 14,
  o: 15,
  p: 16,
  q: 17,
  r: 18,
  s: 19,
  t: 20,
  u: 21,
  v: 22,
  w: 23,
  x: 24,
  y: 25,
  z: 26
};

Tests:

Assign
assign = Object.assign({}, o, {c: 4});
Spread
spread = {...o, c: 4};

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Assign
Spread

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.

I'll break down the provided benchmark definition and test cases, explaining what's being tested, the options compared, pros and cons of each approach, and other considerations.

**Benchmark Definition**

The benchmark definition is represented by the following JSON object:
```json
{
    "Name": "Updating objects 2",
    "Description": null,
    "Script Preparation Code": "...", // see below
    "Html Preparation Code": null
}
```
The script preparation code contains a function named `setC` that creates an object with 26 properties (a-z) and assigns values to each property:
```javascript
v => o => ({
  a: o.a,
  b: o.b,
  c: v,
  d: o.d,
  e: o.e,
  f: o.f,
  g: o.g,
  h: o.h,
  i: o.i,
  j: o.j,
  k: o.k,
  l: o.l,
  m: o.m,
  n: o.n,
  o: o.o,
  p: o.p,
  q: o.q,
  r: o.r,
  s: o.s,
  t: o.t,
  u: o.u,
  v: o.v,
  w: o.w,
  x: o.x,
  y: o.y,
  z: o.z
})
```
This function takes two arguments: `v` (the value to assign to the `c` property) and `o` (the object that will be modified).

**Individual Test Cases**

There are two individual test cases:
```json
[
    {
        "Benchmark Definition": "assign = Object.assign({}, o, {c: 4});",
        "Test Name": "Assign"
    },
    {
        "Benchmark Definition": "spread = {...o, c: 4};",
        "Test Name": "Spread"
    }
]
```
The first test case uses the `Object.assign` method to update the object `o` with a new property-value pair. The second test case uses the spread operator (`...`) to create a new object that includes all properties from `o`, plus an additional property-value pair.

**Options Compared**

In this benchmark, we have two options for updating objects:

1. **Assign**: Using `Object.assign` method.
2. **Spread**: Using the spread operator (`...`).

**Pros and Cons of Each Approach:**

* **Assign**:
	+ Pros:
		- Can handle existing properties (e.g., `o.c`) without overwriting them.
		- Can be used with arbitrary objects and values.
	+ Cons:
		- Requires creating a new object that includes all desired properties, which can lead to increased memory allocation and garbage collection overhead.
* **Spread**:
	+ Pros:
		- Is more concise and expressive than `Object.assign`.
		- Does not require creating a new object (only assigns values to existing properties).
	+ Cons:
		- Can lead to performance issues if the object being spread is large or complex, as it may cause excessive copying of properties.

**Other Considerations:**

* **Library Usage**: Neither test case uses any external libraries.
* **Special JS Features/Syntax**: None mentioned in this benchmark definition. However, some JavaScript features like ES6 classes, destructuring, and generators might be used in other benchmarks or scripts.
* **Alternatives**: Other approaches to updating objects could include:
	+ Using a library like Lodash or Underscore.js for more concise and expressive updates.
	+ Implementing custom update logic using loops and bitwise operations (e.g., for small arrays).
	+ Using alternative object creation methods, such as `Object.create()`.

Please note that the pros and cons mentioned above are general observations and may vary depending on specific use cases and performance requirements.

Related benchmarks:

Updating objects 2 (version: 0)

Comparing performance of: Assign vs Spread

Created: 7 years ago by: Guest

Jump to the latest result

Assign

Spread

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):