var arr = []
for (var i = 0; i < 100000; i++) {
arr.unshift(42)
}
for (var i = 0; i < 100000; i++) {
arr.push(42)
}
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
.unshift() | |
.push() |
Test name | Executions per second |
---|---|
.unshift() | 0.1 Ops/sec |
.push() | 85.3 Ops/sec |
Let's dive into the world of JavaScript microbenchmarks.
Benchmark Definition
The provided JSON represents a benchmark test case that measures the performance difference between two JavaScript methods: arr.push()
and arr.unshift()
. The benchmark is designed to push 100,000 elements onto an array (var arr = []
) using both methods.
Options Compared
Two options are compared in this benchmark:
.push()
: This method adds a new element to the end of an array..unshift()
: This method adds a new element to the beginning of an array.Pros and Cons of Each Approach
arr.push()
:.unshift()
:push()
, as it requires shifting existing elements.Library Used
None is explicitly mentioned in the provided JSON. However, it's likely that the benchmark uses built-in JavaScript methods or libraries like V8 (Chrome's JavaScript engine) for execution.
Special JS Feature/Syntax
There are no specific features or syntax mentioned in the provided code. However, it's worth noting that modern JavaScript engines often employ various optimizations and techniques to improve performance, such as:
Other Considerations
push()
and unshift()
. To get a more comprehensive understanding of an array's performance, you might want to consider measuring other aspects, such as memory usage or cache efficiency.Alternatives
If you're interested in exploring alternative benchmarks or optimizing JavaScript performance, here are some alternatives:
Keep in mind that the choice of benchmarking library or tool often depends on your specific use case, JavaScript version, and desired level of complexity.