Benchmark: Test spead operator vs temporary

Script Preparation code:

var x = {};
for(let i = 0; i < 2000; i++){
 	x[i] = i; 
}

Tests:

test spread
for(let i = 0; i < 100; i++){ x = { [i]: i, ...x } }
test temporary object
let temp = {} for(let i = 0; i < 100; i++){ temp[i] = i; } x = { ...x, ...i }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
test spread
test temporary object

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 explain what is being tested.

The main idea behind this benchmark is to compare two approaches for updating an object: using the spread operator (`...`) and creating a temporary object.

**Test Case 1: "test spread"**

In this test case, we have:
```javascript
for(let i = 0; i < 100; i++){\r\n \tx = { [i]: i, ...x }\r\n}
```
Here, `x` is an object that already exists. The `...x` part creates a new object that contains all the properties of `x`, and then we assign the current value of `i` to each property using bracket notation (`[i]`). This is equivalent to doing:
```javascript
for(let i = 0; i < 100; i++){\r\n \tx[i] = i;\r\n}
```
But instead, we use the spread operator to create a new object.

**Pros:**

* More concise and expressive code.
* Can be more efficient if `x` is large and has many properties.

**Cons:**

* Requires modern JavaScript versions (ECMAScript 2018+).
* May not work in older browsers or environments that don't support the spread operator.

**Test Case 2: "test temporary object"**

In this test case, we have:
```javascript
let temp = {}\r\nfor(let i = 0; i < 100; i++){\r\n \ttemp[i] = i;\r\n}\r\nx = { ...temp, ...i }
```
Here, we create a temporary object `temp` and populate it with values from 0 to 99. Then, we assign the current value of `i` to each property using bracket notation (`[i]`). However, instead of directly assigning `temp`, we use the spread operator to merge `temp` with another object containing only the current value of `i`.

**Pros:**

* Works in older JavaScript versions (ECMAScript 5+).
* Can be more efficient if `x` is large and has many properties.

**Cons:**

* Requires creating a temporary object.
* May not be as concise or expressive as using the spread operator directly.

Now, let's talk about the libraries being used. There doesn't seem to be any external library mentioned in the benchmark definitions.

As for special JavaScript features or syntax, this benchmark uses:

* The spread operator (`...`) which was introduced in ECMAScript 2015.
* Bracket notation (`[i]`) which is a common way to access properties of an object.

The latest benchmark results show that Chrome 66 on Linux Desktop platform outperforms the other browsers (no results for Safari) when running the "test temporary object" test case.

Related benchmarks:

Test spead operator vs temporary (version: 0)

Comparing performance of: test spread vs test temporary object

Created: 7 years ago by: Guest

Jump to the latest result

test spread

test temporary object

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):