var obj = {
'a': 1,
'b': 1,
'c': 1,
'd': 1,
'e': 1,
'f': 1,
'g': 1
};
for (var i=10000; i > 0; i--) {
for (var key in obj) {
console.log(key);
}
}
for (var i=10000; i > 0; i--) {
const keys = Object.keys(obj);
for (const key of keys) {
console.log(key);
}
}
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
for-in | |
Object.keys |
Test name | Executions per second |
---|---|
for-in | 0.9 Ops/sec |
Object.keys | 1.0 Ops/sec |
Let's break down the provided benchmark and explain what is being tested.
Benchmark Definition
The benchmark definition is a JSON object that contains information about the test case. It has three main sections:
obj
with 11 properties, all initialized to 1.Individual Test Cases
The benchmark has two individual test cases:
for-in
loop to iterate over the properties of the obj
object.Object.keys()
method to get an array of property names from the obj
object, and then iterating over that array.Options Compared
The two test cases compare the performance of traditional for-in
loops versus the Object.keys()
method for iterating over an object's properties. The primary difference between these approaches is how they access the object's properties:
for...of
loop or another iteration method.Pros and Cons
Here are some pros and cons for each approach:
Pros:
Cons:
Pros:
for...of
loop or other iteration methods to handle the array returned by Object.keys() more flexibly.Cons:
Library Usage
There is no library explicitly mentioned in the benchmark. However, if you're interested in exploring libraries that can simplify your JavaScript development, some popular ones include:
Special JS Feature or Syntax
There is no special JavaScript feature or syntax explicitly mentioned in the benchmark. However, if you're interested in exploring modern JavaScript features like:
These are advanced topics, but they can improve your coding efficiency and readability.
Alternatives
If you're looking for alternative approaches or tools to measure the performance of your JavaScript code, consider:
Keep in mind that each approach has its strengths and weaknesses, so it's essential to choose the right tool for your specific needs.