Benchmark: Updating objects

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};
Literal
literal = setC(4)(o)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Assign
Spread
Literal

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 JSON benchmark definitions and analyze what is being tested.

**Benchmark Definition**

The `benchmark definition` is a JSON object that describes the test case. It consists of three parts:

1. **Name**: The name of the test case, which is "Updating objects".
2. **Description**: An empty string (`null`) indicating no description for this benchmark.
3. **Script Preparation Code**: A JavaScript function `setC` that takes a value `v` and returns another function `o => { ... }`. This function is used to create a new object with properties inherited from the original object `o`, and additional properties added by assigning the value `v`.

**Individual Test Cases**

The benchmark consists of three test cases, each represented as an object:

1. **Assign**: The test case uses the `Object.assign` method to update the object `o` with a new property `c` assigned the value `4`.
2. **Spread**: The test case uses the spread operator (`...`) to create a new object that inherits properties from `o` and adds a new property `c` assigned the value `4`.
3. **Literal**: The test case uses the `setC` function to update the object `o` with a new property `c` assigned the value `4`, similar to the spread operator, but using the `literal` syntax.

**Library**

The `Object.assign()` method is a built-in JavaScript method that is part of the ECMAScript standard. Its purpose is to create a shallow copy of an object and assign values from one or more source objects to new properties of an existing target object.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax used in this benchmark, apart from the spread operator (`...`), which was introduced in ECMAScript 2015 (ES6).

**Options Compared**

The three test cases compare different approaches for updating objects:

1. **Assign**: Uses the `Object.assign()` method.
2. **Spread**: Uses the spread operator (`...`) to create a new object.
3. **Literal**: Uses the `setC` function to update the object with a literal syntax.

**Pros and Cons of Each Approach**

Here are some pros and cons of each approach:

1. **Assign**: Pros:
	* Wide browser support (even older browsers).
	* Easy to read and maintain code.
	* Can be used for more complex updates.
Cons:
	* May lead to slower performance due to the need to create a new object.
2. **Spread**: Pros:
	* Faster performance since it doesn't require creating a new object.
	* More concise syntax.
	* Easy to use and read.
Cons:
	* Limited browser support (older browsers may not support `...`).
3. **Literal**: Similar pros and cons as the spread operator.

**Other Alternatives**

Other alternatives for updating objects in JavaScript include:

1. **Object.create()**: Creates a new object with the given prototype.
2. **Object.prototype.extend()**: A polyfill for assigning properties to an existing object (although it's not widely supported).
3. **Destructuring assignment**: Assigning values from one or more sources to variables.

Keep in mind that these alternatives may have different performance characteristics and are not as widely supported as the `Object.assign()` method or spread operator.

Related benchmarks:

Updating objects (version: 0)

Comparing performance of: Assign vs Spread vs Literal

Created: 7 years ago by: Guest

Jump to the latest result

Assign

Spread

Literal

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):