var obj = {
a:1,
b:2,
c:3
}
delete obj.a
const { a: _, rest } = obj;
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
delete | |
Rest object |
Test name | Executions per second |
---|---|
delete | 12307864.0 Ops/sec |
Rest object | 1259871.2 Ops/sec |
Let's break down the test case and explain what's being tested.
Benchmark Description The benchmark is comparing two approaches for deleting properties from an object:
delete obj.a
(the "delete" approach)const { a: _, ...rest } = obj;
What are we testing?
We're measuring the performance difference between these two approaches on the same JavaScript engine.
Pros and Cons of each approach:
delete obj.a
)const { a: _, ...rest } = obj;
)This approach is more commonly used and has some performance benefits over the delete approach.
Pros:
Cons:
rest
property.Library usage: There doesn't appear to be any specific library being used in this benchmark. The test case only uses built-in JavaScript features.
Special JS feature/syntax:
None explicitly mentioned, but keep in mind that some modern JavaScript engines might have experimental or optional features enabled, which could potentially affect the results (e.g., const
is a relatively recent feature).
Alternatives to this benchmark:
for...of
loops.splice()
or shift()
.These alternative benchmarks would help to further understand how different JavaScript features impact performance in various contexts.
Keep in mind that the choice of benchmarking approach depends on the specific use case and goals of your testing efforts.