Benchmark: Array concat vs spread vs push spread, loop, apply (bigger cases)

Script Preparation code:

var subarrs = [
 [ "hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7 ],
 [ "yes", "no", "maybe", false, 27,"yes", "no", "maybe", false, 27,"yes", "no", "maybe", false, 27,"yes", "no", "maybe", false, 27,"yes", "no", "maybe", false, 27,"yes", "no", "maybe", false, 27,"yes", "no", "maybe", false, 27,"yes", "no", "maybe", false, 27,"yes", "no", "maybe", false, 27,"yes", "no", "maybe", false, 27 ],
 [ 16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest",16, "I", "wonder", "what", "will", "be", "fastest" ]
];

Tests:

Array.prototype.concat
var other = [ 1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3 ] for (var len = subarrs.length, i = 0; i < len; i++){ other = other.concat(subarrs[i]); } return other;
spread operator
var other = [ 1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3 ] for (var len = subarrs.length, i = 0; i < len; i++){ other = [ ...other, ...subarrs[i] ] } return other;
Push Spread
var other = [ 1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3 ] for (var len = subarrs.length, i = 0; i < len; i++){ other.push(...subarrs[i]); } return other;
Push Apply
var other = [ 1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3 ] for (var len = subarrs.length, i = 0; i < len; i++){ other.push.apply(other, subarrs[i]); } return other;
Push Loop
var other = [ 1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3,1, 2, 3 ] for (var len = subarrs.length, i = 0; i < len; i++){ for (var jarr = subarrs[i], jen = jarr.length, j = 0; j < jen; j++){ other.push(jarr[j]); } } return other;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator
Push Spread
Push Apply
Push Loop

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

Latest run results:

Run details: (Test run date: 8 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36 Edg/122.0.0.0

Browser/OS: Chrome 122 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	843861.6 Ops/sec
spread operator	92860.5 Ops/sec
Push Spread	680930.2 Ops/sec
Push Apply	595711.4 Ops/sec
Push Loop	105526.9 Ops/sec

Related benchmarks:

Array concat vs spread vs push spread, loop, apply (bigger cases) (version: 0)

Compare the new ES6 spread operator with the traditional concat() method and push

Comparing performance of: Array.prototype.concat vs spread operator vs Push Spread vs Push Apply vs Push Loop

Created: 8 months ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Push Spread

Push Apply

Push Loop

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):