Benchmark: array find vs. object access

Script Preparation code:

var arr1 = [26151771,
43740574,
63251361,
16664640,
98278385,
77871863,
29846213,
22855546,
73117005,
14272931,
26257507,
48404799,
33962546,
74589143,
65792224,
61526376,
81163137,
62305274,
91767669,
10724813,
72235570,
83204899,
28336814,
43165840,
42682632,
11898964,
86490091,
62257218,
39220214,
36675640,
60842644,
97298952,
66081567,
51168479,
50715262,
65700349,
83417722,
99578496,
25258536,
21667229,
95406635,
15559505,
74866618,
44258359,
31135138,
31518088,
92781538,
25494057,
98326952]

var testArr = [26151771,
43740574,
63251361,
16664640,
98278385,
77871863,
29846213,
22855546,
73117005,
14272931,
26257507,
48404799,
33962546,
74589143,
65792224,
61526376,
81163137,
62305274,
91767669,
10724813,
72235570,
83204899,
28336814,
43165840,
42682632,
11898964,
86490091,
62257218,
39220214,
36675640,
60842644,
97298952,
66081567,
51168479,
50715262,
65700349,
83417722,
99578496,
25258536,
21667229,
95406635,
15559505,
74866618,
44258359,
31135138,
31518088,
92781538,
25494057,
98326952];

var testObj = {
'26151771': true,
'43740574': true,
'63251361': true,
'16664640': true,
'98278385': true,
'77871863': true,
'29846213': true,
'22855546': true,
'73117005': true,
'14272931': true,
'26257507': true,
'48404799': true,
'33962546': true,
'74589143': true,
'65792224': true,
'61526376': true,
'81163137': true,
'62305274': true,
'91767669': true,
'10724813': true,
'72235570': true,
'83204899': true,
'28336814': true,
'43165840': true,
'42682632': true,
'11898964': true,
'86490091': true,
'62257218': true,
'39220214': true,
'36675640': true,
'60842644': true,
'97298952': true,
'66081567': true,
'51168479': true,
'50715262': true,
'65700349': true,
'83417722': true,
'99578496': true,
'25258536': true,
'21667229': true,
'95406635': true,
'15559505': true,
'74866618': true,
'44258359': true,
'31135138': true,
'31518088': true,
'92781538': true,
'25494057': true,
'98326952': true
};

Tests:

array find
arr1.forEach(item => testArr.find(item))
obj access
arr1.forEach(item => testObj[item])

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array find
obj access

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark definition and options compared.

**Benchmark Definition:**

The benchmark measures the performance of two different approaches:

1. `arr1.forEach(item => testArr.find(item))`: This approach uses the `find` method to search for an item in the `testArr` array within a `forEach` loop.
2. `arr1.forEach(item => testObj[item])`: This approach uses object access to retrieve the value associated with each item in the `testObj` object within a `forEach` loop.

**Options compared:**

The benchmark compares the performance of these two approaches on a large dataset.

**Pros and Cons:**

* **Array-based approach (`arr1.forEach(item => testArr.find(item))`)**:
	+ Pros: Easy to implement, uses built-in JavaScript methods.
	+ Cons: May be slower due to the overhead of the `find` method.
* **Object-based approach (`arr1.forEach(item => testObj[item])`)**:
	+ Pros: Can be faster for large datasets since object access is typically O(1) compared to array-based approaches like `find`, which has a time complexity of O(n).
	+ Cons: Requires explicit key management and may be less intuitive.

**Library/Functionality Used:**

* The benchmark uses the `forEach` method, which is a built-in JavaScript function.
* The `find` method is also a built-in JavaScript function.
* No external libraries are used in this benchmark.

No special JavaScript features or syntax are mentioned in this benchmark. However, if you're interested in exploring other approaches, we can discuss some alternatives.

**Alternative Approaches:**

Some alternative approaches to compare with the above methods include:

1. Using `indexOf` method instead of `find`: This can be slightly faster than `find`, but may not work correctly for arrays that contain duplicate values.
2. Using a linear search algorithm: This involves manually searching through the array or object, which can be slower than built-in methods like `forEach` and `find`.
3. Using a more efficient data structure, such as a hash table or a Trie, to store the elements of the array or object.

If you'd like to explore any of these alternative approaches, feel free to ask!

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser/OS: Chrome 119 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
array find	0.0 Ops/sec
obj access	549940.3 Ops/sec

Related benchmarks:

array find vs. object access (version: 0)

Comparing performance of: array find vs obj access

Created: one year ago by: Guest

Jump to the latest result

array find

obj access

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):