Benchmark: map-array-object

Script Preparation code:

var map = new Map();
var arr = [];
var obj = {};

var randomU32 = function() {
	return (Math.random() * (1 << 31) >>> 0).toString();
}

Tests:

m
map.set(randomU32(), true);
a
arr[randomU32()] = true;
o
obj[randomU32()] = true;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
m
a
o

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.

Let's break down the provided benchmark and explain what is being tested, compared, and the pros/cons of different approaches.

**Benchmark Definition**

The benchmark consists of three test cases:

1. `map.set(randomU32(), true);` (Test Name: "m")
2. `arr[randomU32()] = true;` (Test Name: "a")
3. `obj[randomU32()] = true;` (Test Name: "o")

**What is being tested?**

These test cases are designed to measure the performance of JavaScript's Map, Array, and Object data structures.

**Options compared**

In this benchmark, two options are being compared:

1. **Map**: The `map.set()` method is used to add a new key-value pair to a Map.
2. **Array**: The `arr[randomU32()] = true;` expression is used to access an element in the array and set its value to `true`.

**Pros/Cons of different approaches**

1. **Map**:
	* Pros: Maps are designed for fast lookups, insertions, and deletions. They provide O(1) average case time complexity.
	* Cons: Maps require more memory compared to arrays, as they need to store a separate entry for each key-value pair.
2. **Array**:
	* Pros: Arrays are widely used and have good performance for simple indexing operations.
	* Cons: Array indices must be integers, which can lead to issues when dealing with non-integer values (like `randomU32()`).

**Library usage**

In this benchmark, the following libraries/libraries-like structures are used:

1. **Map**: JavaScript's built-in Map object is being used.

No library is explicitly mentioned for arrays or objects, as they are native data structures in JavaScript.

**Special JS feature/syntax**

The `>>> 0` operator (also known as integer truncation) is used to convert a floating-point number (`Math.random() * (1 << 31)` ) to an unsigned 32-bit integer. This is done to ensure that the generated random numbers are within the range of 0 to 2^32-1.

**Other alternatives**

There are alternative data structures and approaches you could use for similar operations:

1. **WeakMap**: A WeakMap is a type of Map that allows garbage collection, making it suitable for situations where memory management is critical.
2. **TypedArray**: TypedArray provides efficient indexing operations with better performance than regular arrays.
3. **Object with custom index**: You can create an object with a custom indexing mechanism, such as using a custom class or a library like Lodash's `get()` function.

These alternatives may offer improved performance or specific use cases where the original approach is not suitable. However, they also introduce additional complexity and memory usage, which should be carefully considered in the context of your specific requirements.

Related benchmarks:

map-array-object (version: 0)

Comparing performance of: m vs a vs o

Created: 7 years ago by: Guest

Jump to the latest result

m

a

o

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):