Benchmark: Map vs Object (white)

Script Preparation code:

var map = new Map();
var obj = {};

var i = 0, count = 1000;

Tests:

Map
for (i = 0; i < count; i++) { map.set(i, i); }
Object
for (i = 0; i < count; i++) { obj[i] = i; }

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:

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

LLMs can make mistakes. Check important info.

I'd be happy to explain what's being tested in this benchmark and compare different approaches.

**Benchmark Overview**

The benchmark compares the performance of two data structures: `Map` and `Object`. Both data structures are used to store key-value pairs, but they have different underlying implementations.

**Script Preparation Code**

Before running the test cases, the script prepares two data structures:

*   `map`: An instance of a JavaScript `Map` object.
*   `obj`: An empty JavaScript `Object`.

The code also initializes two variables: `i`, which will be used as the key in both data structures, and `count`, which represents the number of iterations for each test case (set to 1000).

**Html Preparation Code**

There is no HTML preparation code provided, which means that this benchmark does not involve rendering or parsing any HTML content.

**Test Cases**

The benchmark consists of two test cases:

*   **Map**: Iterates over a range from 0 to `count-1` and sets each value in the `map` data structure to its corresponding key.
*   **Object**: Iterates over the same range and assigns each value in the `obj` object to its corresponding key.

**Comparison of Approaches**

The two approaches differ mainly in how they store and access their data:

*   **Map**: In JavaScript, a `Map` object is implemented as an ordered collection of key-value pairs. When you iterate over a `Map`, it performs a linear search for each iteration to find the corresponding value associated with a given key. On the other hand, when you directly index into a `Map` using its key (like `map.get(i)`), it returns the associated value immediately.
*   **Object**: In contrast, an object is implemented as a collection of properties stored in a single block of memory. Iterating over an object involves accessing each property by name, which can be slower than directly indexing into an array or `Map` since there are more lookups involved.

**Pros and Cons**

Here's a brief summary of the pros and cons for each approach:

*   **Map:**
    *   Pros:
        *   Faster lookups since keys are hashed.
        *   More memory-efficient than objects, as it stores keys and values separately.
        *   Ordered iteration is guaranteed, which can be useful in certain scenarios.
    *   Cons:
        *   Less intuitive for beginners who are familiar with object-oriented programming.
*   **Object:**
    *   Pros:
        *   More intuitive and easier to understand for developers familiar with object-oriented programming.
        *   Easier to create and manipulate objects using dot notation (e.g., `obj.property = value;`).
    *   Cons:
        *   Slower lookups due to additional overhead from property lookup.

**Special JS Feature/ Syntax**

There is no special JavaScript feature or syntax being tested here. The benchmark focuses solely on the performance comparison between two basic data structures: `Map` and `Object`.

**Alternatives**

If you're interested in exploring alternatives, some other data structures that might be of interest include:

*   **Set**: Similar to a `Map`, but without the key-value pairs.
*   **Array**: A contiguous collection of values, which can be used for various operations like searching and insertion.
*   **WeakMap**: A `Map` variant that allows for weak references, making it suitable for use with garbage-collected objects.

Keep in mind that each data structure has its strengths and weaknesses, depending on the specific requirements of your project.

Related benchmarks:

Map vs Object (white) (version: 0)

White of map vs object

Comparing performance of: Map vs Object

Created: 5 years ago by: Registered User

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):