var arr = ['1', '2', '3'];
if (arr.length) {
return arr;
}
return undefined;
if (!arr.length) {
return ;
}
return arr;
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
check true | |
check false |
Test name | Executions per second |
---|---|
check true | 14652589.0 Ops/sec |
check false | 14760359.0 Ops/sec |
I'll break down the provided benchmark definition and test cases to help explain what's being tested.
Benchmark Definition
The benchmark definition is represented as a JSON object that contains the following properties:
Name
: A descriptive name for the benchmark, which in this case is "check array size with and without neg".Description
: An empty string, indicating that there is no description provided.Script Preparation Code
: A snippet of JavaScript code that initializes an array arr
containing three elements: '1'
, '2'
, and '3'
.Html Preparation Code
: An empty string, indicating that no HTML code is required.The script preparation code sets up a constant array arr
before running the benchmark. This allows the benchmark to focus on measuring the performance of the JavaScript code inside the test cases.
Individual Test Cases
There are two test cases defined:
if (arr.length) { return arr; } return undefined;
if (!arr.length) { return ; } return arr;
undefined
).Comparison of Options
The two test cases differ in how they handle the presence or absence of elements in the array:
Pros and Cons
The pros and cons of each approach are:
Library Usage
There doesn't appear to be any library usage in these benchmark definitions. The code relies solely on standard JavaScript features and syntax.
Special JS Features/Syntax
None are explicitly mentioned or utilized in this benchmark definition. However, it's worth noting that the use of return
statements with no explicit value can have implications for the behavior of some browsers or environments, especially when dealing with falsy values like undefined
.
Other Alternatives
For a more comprehensive set of test cases, you might consider adding additional scenarios to cover:
arr.length === 0
).These additional test cases can provide more insight into how the JavaScript engine handles array operations and improve the overall accuracy of the benchmark results.