Array.isArray([])
typeof([]) === 'object'
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
adosad | |
grgrwgerg |
Test name | Executions per second |
---|---|
adosad | 4842909.5 Ops/sec |
grgrwgerg | 183956048.0 Ops/sec |
Let's dive into the world of microbenchmarks!
The provided JSON represents a benchmark definition on MeasureThat.net, which allows users to create and run JavaScript microbenchmarks.
Benchmark Definition
The "Name" field is set to "asados", but it doesn't provide much context. The "Description" field is empty, so we'll have to infer the purpose of this benchmark from the individual test cases.
Individual Test Cases
There are two test cases:
Array.isArray([])
=> typeof([]) === 'object'
Array.isArray([])
(same as above)adosad
).What's being tested?
In this benchmark, we're testing how long it takes for JavaScript engines to execute two different approaches to determine if an array is empty.
The first approach uses Array.isArray()
method, which returns true
if the given value is an array.
The second approach checks the type of the given value using typeof()
, and asserts that its type is 'object'
.
What options are compared?
In this case, there's only one option being compared: Array.isArray([])
vs. typeof([]) === 'object'
. These two approaches are essentially equivalent in terms of determining if an array is empty.
Pros/Cons and other considerations
Other alternatives
There aren't many other alternatives to compare here. If you need to check if an array is empty, Array.isArray()
and typeof([]) === 'object'
are two common approaches. You could also use a simple condition like arr.length === 0
, but that would not be compared in this benchmark.
Library/Feature Used
No libraries or special JavaScript features are used in these test cases. The only method being used is Array.isArray()
and the built-in typeof
operator.
I hope this explanation helps you understand what's going on behind the scenes of this microbenchmark!