const map = new Map();
map.get('0');
const weakMap = new WeakMap();
weakMap.get('0');
const array = [];
array[0];
const object = {};
object.a;
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Map.get | |
weakMap.get | |
Array | |
Object |
Test name | Executions per second |
---|---|
Map.get | 4181675.5 Ops/sec |
weakMap.get | 3425960.8 Ops/sec |
Array | 472364960.0 Ops/sec |
Object | 520553376.0 Ops/sec |
Let's dive into the provided JSON and explore what's being tested in this JavaScript microbenchmark.
Benchmark Definition
The benchmark definition is quite straightforward: it measures the execution time of accessing values with keys in different data structures - arrays, objects, maps (with both weak and regular maps), and weak maps. The goal is to compare the performance of these different approaches.
Options Compared
Here are the options being compared:
array[0]
).object.a
).get()
method (map.get('0')
).get()
method (weakMap.get('0')
).Pros and Cons of Each Approach
Here's a brief overview of each approach:
get()
method, which has an average time complexity of O(1).get()
method still has an average time complexity of O(1), and the benefits of weak maps depend on the specific use case.Library Usage
In this benchmark, none of the libraries (e.g., jQuery) is explicitly mentioned. However, it's worth noting that some data structures might rely on underlying library implementations or optimizations.
Special JS Features/Syntax
None of the benchmark definitions explicitly uses special JavaScript features like async/await, Promises, or modern syntax (e.g., arrow functions). This suggests that the focus is on basic, straightforward access operations rather than more complex use cases.
Alternatives
If you're interested in exploring alternative approaches, consider the following:
benchmark
or micro-benchmark
provide more structured benchmarks and might offer additional features, such as support for multiple execution modes (e.g., async/await).performance.now()
or Date
.Keep in mind that this specific benchmark focuses on basic access operations, so it might not be directly applicable for more complex use cases. However, understanding the underlying principles can help you develop your own benchmarks or optimize existing code.