var arr1 = [ 1,2,3,4,5,6,7,8,9,10 ];
var arr2 = [ 1,2,3,4,5,6,7,8,9,10 ];
var newArr = arr1.concat(arr2);
var arr1 = [ 1,2,3,4,5,6,7,8,9,10 ];
var arr2 = [ 1,2,3,4,5,6,7,8,9,10 ];
var newArr = arr1.push(arr2);
var arr1 = [ 1,2,3,4,5,6,7,8,9,10 ];
var arr2 = [ 1,2,3,4,5,6,7,8,9,10 ];
var newArr = [arr1, arr2];
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Array.prototype.concat | |
push with spread operator | |
spread operator |
Test name | Executions per second |
---|---|
Array.prototype.concat | 4893896.5 Ops/sec |
push with spread operator | 2058024.9 Ops/sec |
spread operator | 3463128.2 Ops/sec |
Overview
MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks, comparing different approaches to achieve similar results. In this explanation, we'll break down the provided JSON benchmark definition, test cases, and latest benchmark result.
Benchmark Definition
The benchmark definition provides a brief description of the test case: "Compare the new ES6 spread operator with the traditional concat()
method".
Test Cases
There are three test cases:
Array.prototype.concat
: This test case uses the traditional concat()
method to combine two arrays.push with spread operator
: This test case uses the push()
method with a spread operator (...
) to concatenate two arrays.spread operator
: This test case uses a spread operator (...
) to concatenate two arrays, similar to the previous one but without using push()
.Options Compared
The three test cases compare different approaches to achieve the same result:
concat()
methodpush()
with a spread operator (...
)...
)Pros and Cons of Each Approach
concat()
method:push()
with spread operator (...
):...
):Libraries Used
None are explicitly mentioned in this benchmark definition.
Special JS Features or Syntax
The benchmark definition uses modern JavaScript features such as:
...
)var newArr = [...arr1, ...arr2];
)These features are widely supported in modern browsers and JavaScript engines.
Other Alternatives
If the test cases were modified to use other approaches, some alternatives could include:
Array.prototype.reduce()
or Array.prototype.slice()
to concatenate arrays.However, the spread operator and push()
with spread operator are likely the most efficient and modern approaches for this specific task.