Benchmark: Map vs Object test with unicode

Script Preparation code:

var N_TRIES = 5000000;
    var GENDER_FEMALE = 0;
    var GENDER_MALE = 1;
    var obj = {
        '\u{1f937}': GENDER_FEMALE,
        '\u{1f938}': GENDER_MALE,
        '\u{1f939}': GENDER_MALE,
        '\u{1f6a3}': GENDER_MALE,
        '\u{1f575}': GENDER_MALE,
        '\u{1f646}': GENDER_FEMALE,
        '\u{1f647}': GENDER_MALE,
        '\u{1f645}': GENDER_FEMALE,
        '\u{1f46f}': GENDER_FEMALE,
        '\u{1f46e}': GENDER_MALE,
        '\u{1f926}': GENDER_MALE,
        '\u{1f471}': GENDER_MALE,
        '\u{1f9d8}': GENDER_FEMALE,
        '\u{1f473}': GENDER_MALE,
        '\u{1f6b6}': GENDER_MALE,
        '\u{1f477}': GENDER_MALE,
        '\u{1f9de}': GENDER_FEMALE,
        '\u{1f3c4}': GENDER_MALE,
        '\u{1f3c3}': GENDER_MALE,
        '\u{1f9d7}': GENDER_FEMALE,
        '\u{1f9d6}': GENDER_MALE,
        '\u{26f9}': GENDER_MALE,
        '\u{1f9df}': GENDER_FEMALE,
        '\u{1f481}': GENDER_FEMALE,
        '\u{1f482}': GENDER_MALE,
        '\u{1f6b4}': GENDER_MALE,
        '\u{1f6b5}': GENDER_MALE,
        '\u{1f486}': GENDER_FEMALE,
        '\u{1f487}': GENDER_FEMALE,
        '\u{1f9dd}': GENDER_MALE,
        '\u{1f9da}': GENDER_FEMALE,
        '\u{1f9dc}': GENDER_FEMALE,
        '\u{1f9db}': GENDER_FEMALE,
        '\u{1f3cb}': GENDER_MALE,
        '\u{1f3cc}': GENDER_MALE,
        '\u{1f3ca}': GENDER_MALE,
        '\u{1f64d}': GENDER_FEMALE,
        '\u{1f64e}': GENDER_FEMALE,
        '\u{1f64b}': GENDER_FEMALE,
        '\u{1f9d9}': GENDER_FEMALE,
        '\u{1f93c}': GENDER_MALE,
        '\u{1f93d}': GENDER_MALE,
        '\u{1f93e}': GENDER_FEMALE,
    };
    var map = new Map(Object.entries(obj));
    var elems = Object.keys(obj);

Tests:

Map
for (let j = 0; j < elems.length; ++j) { map.get(elems[j]); }
Object
for (let j = 0; j < elems.length; ++j) { obj[elems[j]]; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map
Object

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**What is being tested?**

The benchmark is testing two approaches to access and retrieve values from a data structure: Maps (`map`) and Objects (`obj`).

**Options compared:**

Two options are being compared:

1. **Map**: Using a `Map` data structure to store key-value pairs, where each key is unique and corresponds to a specific value.
2. **Object**: Using an Object literal to store key-value pairs, where each key is a string (a Unicode character in this case) and corresponds to a specific value.

**Pros and Cons:**

**Map:**

Pros:

* Efficient lookups: Maps use hash tables, which provide fast lookup times (O(1)) for keys.
* No collisions: Each key-value pair is unique, eliminating the need for collision resolution.

Cons:

* Additional memory overhead: Maps require more memory to store the underlying data structure.
* Limited iteration order: Iterating over a Map can be non-deterministic due to hash table behavior.

**Object:**

Pros:

* Lightweight: Objects require less memory compared to Maps.
* Deterministic iteration order: Iterating over an Object is guaranteed in a specific order (by key).

Cons:

* Slow lookups: Objects use linear search, which has a time complexity of O(n), making lookups slower for large datasets.

**Other considerations:**

In this benchmark, the test cases are designed to measure the execution speed of accessing and retrieving values from both Maps and Objects. The `elems` array is used as keys in both data structures, and the test case iterates over these elements to access their corresponding values.

**Library and syntax features:**

* No specific libraries are mentioned in the benchmark definition or individual test cases.
* No special JavaScript features or syntax are being tested; it appears to be a basic comparison of Map and Object performance.

**Alternatives:**

Other data structures that could be used for this benchmark include:

* Arrays with indices
* Sets (for fast lookups, but potentially slower iteration)
* Hash tables specifically designed for JavaScript (e.g., `Object.create()`, `Map()`)

Keep in mind that these alternatives might affect the results of the benchmark and may not provide the same level of performance as Maps or Objects.

Related benchmarks:

Map vs Object test with unicode (version: 0)

Comparing performance of: Map vs Object

Created: 6 years ago by: Guest

Jump to the latest result

Map

Object

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):