var arr = [];
for (let i = 1; i <= 100; i++) {
arr.push({ id: i, name: `${i}` });
}
var arr2 = [];
for (let i = 101; i <= 200; i++) {
arr.push({ id: i, name: `${i}` });
}
var map = new Map(arr.map(item => [item.id, item]));
const map2 = new Map(arr2.map(item => [item.id, item]));
map = new Map([map, arr2.map(item => [item.id, item])]);
arr2.forEach(item => {
map.set([item.id, item])
});
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
new Map | |
push array to map |
Test name | Executions per second |
---|---|
new Map | 129696.8 Ops/sec |
push array to map | 121318976.0 Ops/sec |
Let's break down the provided JSON and explain what's being tested.
Benchmark Definition
The benchmark is testing two approaches to create a new Map from an array of objects:
map
method (new Map(arr2.map(item => [item.id, item])))
.set
method (arr2.forEach(item => { ... });
).Options Compared
The benchmark is comparing two approaches:
map
method)set
method)Pros and Cons of Each Approach
Approach 1: New Map creation from existing Map
Pros:
Cons:
Approach 2: Pushing array elements to a new Map
Pros:
Cons:
Other Considerations
Both approaches have their trade-offs. The map
method approach is generally considered more concise and readable, but might be slower for large datasets. The push
array elements to a new Map approach can be faster but is more verbose and error-prone.
Library Used
In the provided benchmark definition, no specific library is used beyond JavaScript's built-in Map
, Array
, and set
methods.
Special JS Feature or Syntax
The benchmark does not use any special JavaScript features or syntax. It only relies on standard JavaScript concepts and methods.
Benchmark Result Interpretation
According to the latest benchmark result, the push array elements to a new Map
approach outperforms the new Map creation from existing Map
approach by approximately 2.3x (12998737 / 56132 ≈ 2.31). This suggests that pushing individual elements into a new Map can be faster for this specific use case.
Alternative Approaches
If you're interested in exploring alternative approaches, consider the following:
Array.prototype.reduce
to create a new Map from an array of objects.Keep in mind that these alternatives might introduce additional dependencies or trade-offs, so it's essential to consider the specific requirements and constraints of your use case before exploring them.