let obj = {};
for (let i = 0; i < 10000; i++) {
obj[i] = i;
}
let tuples = Object.entries(obj).map(([k, v]) => [k, v]);
let map = new Map();
for (let i = 0; i < 10000; i++) {
map.set(i, i);
}
let tuples = [map].map(([k, v]) => [k, v]);
let map = new Map();
for (let i = 0; i < 10000; i++) {
map.set(i, i);
}
let tuples = Array.from(map).map(([k, v]) => [k, v]);
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Obj / Object.entries() | |
Map / spread | |
Map / Array.from() |
Test name | Executions per second |
---|---|
Obj / Object.entries() | 1076.8 Ops/sec |
Map / spread | 635.0 Ops/sec |
Map / Array.from() | 684.2 Ops/sec |
Let's break down the provided benchmark and its test cases.
Benchmark Definition JSON
The provided JSON represents a benchmark definition, which includes:
Name
: A unique name for the benchmark.Description
: An optional description of the benchmark (empty in this case).Script Preparation Code
and Html Preparation Code
: These are empty strings, indicating that no specific code needs to be executed before running the benchmark.Individual Test Cases
There are three test cases:
Object.entries()
method to iterate over an object and convert its key-value pairs into an array of tuples.[...]
). The resulting array is mapped over to create an array of tuples.Array.from()
to convert the map into an array before mapping over it.Options Compared
The three test cases are comparing the performance of different approaches:
Object.entries()
vs. using a Map and the spread operator ([...]
).Array.from()
vs. using a Map and the spread operator ([...]
).Pros and Cons of Each Approach
Here's a brief overview of each approach:
Object.entries()
and once again with [...]
).Library and Purpose
In this benchmark, no external libraries are used. However, JavaScript's built-in Map
data structure is utilized in all test cases.
Special JS Feature or Syntax
None of the test cases use any special JavaScript features or syntax beyond what is commonly available in modern JavaScript implementations.
Alternatives
Other approaches to iterate over objects and maps could include:
mapKeys()
or mapValues()
.for (let i = 0; i < obj.length; i++) { ... }
).Keep in mind that these alternatives might not be as efficient or optimized for modern JavaScript engines, but they can provide alternative perspectives on the problem.