Benchmark: Assignment of value vs Destructuring an object e

Tests:

Destructure
const obj = {a: 'a', b: 'b'}; const dupl = {a: 'a', c: 'c'}; const { a } = obj const newObj = {...dupl, a} console.log(newObj);
Assign
const obj = {a: 'a', b: 'b'}; const dupl = {a: 'a', c: 'c'}; const newObj = dupl newObj.a = obj.a console.log(newObj);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Destructure
Assign

Fastest: N/A

Slowest: N/A

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

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Let's break down the provided benchmark and explain what is being tested.

The test cases are designed to compare two approaches for assigning values to an object: using destructuring (`Destructure`) versus using the assignment operator (`Assign`).

**Assignment of value vs Destructuring an object e**

This benchmark tests two different methods for creating a new object with modified properties:

1. **Destructuring (`Destructure`)**:
```javascript
const obj = {a: 'a', b: 'b'};
const dupl = {a: 'a', c: 'c'};
const { a } = obj;
const newObj = {...dupl, a};
console.log(newObj);
```
In this approach, we first extract the `a` property from the original object `obj` using destructuring. We then create a new object `newObj` by spreading the properties of `dupl`, and finally assign the value of `obj.a` to `newObj.a`.

2. **Assignment (`Assign`)**:
```javascript
const obj = {a: 'a', b: 'b'};
const dupl = {a: 'a', c: 'c'};
const newObj = dupl;
newObj.a = obj.a;
console.log(newObj);
```
In this approach, we create a new object `newObj` by simply assigning the value of `dupl` to it. We then modify the `a` property of `newObj` by assigning the value of `obj.a`.

**Options compared**

The benchmark compares two approaches:

* **Destructuring (`Destructure`)**
* **Assignment (`Assign`)**

**Pros and Cons**

* **Destructuring (`Destructure`)**:
	+ Pros:
		- More concise and readable code
		- Less prone to errors (e.g., typos in property names)
	+ Cons:
		- May be slower due to the creation of a new object with spread properties
* **Assignment (`Assign`)**
	+ Pros:
		- Faster, as it only involves modifying an existing object
	+ Cons:
		- Less readable code
		- More prone to errors (e.g., typos in property names or incorrect assignment)

**Library usage**

None of the test cases use any libraries. The benchmark relies solely on standard JavaScript features.

**Special JS feature or syntax**

The `...` operator is used for spread properties, which was introduced in ECMAScript 2015 (ES6). This allows us to create a new object by spreading the properties of an existing object. There are no other special features or syntaxes used in this benchmark.

Now, let's look at some alternative approaches:

* **Using `Object.assign()`**: Instead of using destructuring or assignment, we could use `Object.assign()` to create a new object:
```javascript
const newObj = Object.assign({}, dupl, {a: obj.a});
```
This approach would likely be slower than the original assign and destruct option.

* **Using a loop**: We could also use a loop to iterate over the properties of `dupl` and create a new object:
```javascript
const newObj = {};
for (const key in dupl) {
    if (key === 'a') newObj[key] = obj.a;
}
```
This approach would likely be slower than the original assign and destruct option as well.

Keep in mind that these alternative approaches may not provide the same readability or conciseness as the original `Destructure` and `Assign` options.

Related benchmarks:

Assignment of value vs Destructuring an object e (version: 0)

Comparing performance of: Destructure vs Assign

Created: 3 years ago by: Guest

Jump to the latest result

Destructure

Assign

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):