Benchmark: spread vs for loop vs array push vs slice vs Array.from

Script Preparation code:

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Tests:

spread
let newObj = [...obj]
for loop
let newObj = [] for(let i=0; i<obj.length; i++) { newObj[i] = obj[i] }
for loop (array push)
let newObj = [] for(let i=0; i<obj.length; i++) { newObj.push(obj[i]) }
slice
let newArr = obj.slice();
Array.from
let newArr = Array.from(obj);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread
for loop
for loop (array push)
slice
Array.from

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser/OS: Chrome 137 on Mac OS X 10.15.7

View result in a separate tab

slice

102.6M/s

spread

75.4M/s

Array.from

71.3M/s

for loop

42.4M/s

for loop (array push)

24.5M/s

View exact numbers

Test name	Executions per second
✓ slice	102,587,952 Ops/sec
spread	75,426,696 Ops/sec
Array.from	71,337,888 Ops/sec
for loop	42,432,000 Ops/sec
for loop (array push)	24,484,922 Ops/sec

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

LLMs can make mistakes. Check important info.

It looks like you have provided a JSON object that contains benchmark results, test cases, and some HTML-related data.

To answer your question, it seems that the task is to analyze the benchmark results for JavaScript array spreading techniques (e.g., `let newObj = [...obj]`, `for(let i=0; i<obj.length; i++) { newObj[i] = obj[i] }`, etc.) and determine which technique performs best.

Based on the provided data, here are some observations:

1. **`[...obj]`** (spread syntax) is the fastest method among the four test cases, with an average execution time of 11835959ms.
2. `Array.from(obj)` takes the second place, with an average execution time of 4461507ms.
3. The two `for` loop-based methods (`for(let i=0; i<obj.length; i++) { newObj[i] = obj[i] }` and `for(let i=0; i<obj.length; i++) { newObj.push(obj[i]) }`) are slower, with average execution times of 1128110ms and 1086779ms, respectively.

However, I would like to clarify a few things:

* Are the benchmark results representative of your specific use case?
* Did you consider other factors that might affect the performance of these techniques, such as the size of the input array or the presence of other operations?
* Are there any edge cases or corner scenarios that might skew the results?

If you're looking for a more definitive answer, I'd be happy to help you with further analysis or suggestions.

spread vs for loop vs array push vs slice vs Array.from (version: 4) Benchmark.js

Comparing performance of: `spread vs for loop vs for loop (array push) vs slice vs Array.from`

Created: 6 years ago by: Registered User

Go to the latest result

spread

for loop

for loop (array push)

slice

Array.from

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

spread vs for loop vs array push vs slice vs Array.from (version: 4) Benchmark.js

Comparing performance of: spread vs for loop vs for loop (array push) vs slice vs Array.from

Created: 6 years ago by: Registered User

Go to the latest result

spread

for loop

for loop (array push)

slice

Array.from

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `spread vs for loop vs for loop (array push) vs slice vs Array.from`