Benchmark: Object.assign vs deconstruct vs inline

Tests:

deconstruct
"use strict"; class Box { constructor(params = {}) { var { x = 0, y = [1,2,3], height = 1, width = 1 } = params; this.x = x; this.y = y; this.height = height; this.width = width; } } const b = new Box({ x:3, y: [4,5,6], height: 23, width: 1}); console.assert(b.x === 3)
Object.assign
class Box { constructor(params = {}){ this.x = 0; this.y = [1,2,3]; this.height = 1; this.width = 1; Object.assign(this, params); } } const a = new Box({ x:3, y: [4,5,6], height: 23, width: 1}); console.assert(a.x === 3)
inline
class Box { constructor(params){ this.x = params.x ?? 0; this.y = params.y ?? [1,2,3]; this.height = params.height ?? 1; this.width = params.width ?? 1; } } const a = new Box({ x:3, y: [4,5,6], height: 23, width: 1}); console.assert(a.x === 3)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
deconstruct
Object.assign
inline

Fastest: N/A

Slowest: N/A

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

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I'll break down the provided benchmark definition and test cases to explain what's being tested.

**Benchmark Definition**
The `MeasureThat.net` website provides a simple benchmarking framework, allowing users to create and run JavaScript microbenchmarks. In this case, we have a single benchmark with three test cases:

*   **Object.assign**: This test measures the performance of using the `Object.assign()` method to merge objects.
*   **Deconstruct (Destructuring)**: This test measures the performance of destructuring an object using the syntax `{ variableName = value }`.
*   **Inline**: This test measures the performance of directly assigning values to object properties within the constructor.

**Options Compared**
The benchmark compares three approaches:

1.  **Object.assign()**: Uses the `Object.assign()` method to merge objects.
2.  **Deconstruct (Destructuring)**: Uses destructuring syntax to extract values from an object.
3.  **Inline**: Directly assigns values to object properties within the constructor.

**Pros and Cons of Each Approach**

*   **Object.assign()**:
    *   Pros:
        *   Well-documented and widely supported.
        *   Can handle complex object merges with ease.
    *   Cons:
        *   May incur performance overhead due to method call and array creation.
*   **Deconstruct (Destructuring)**:
    *   Pros:
        *   Efficient, as it avoids method calls and array creations.
        *   Readable and concise syntax.
    *   Cons:
        *   Not supported in older browsers or environments with limited JavaScript features.
        *   May not work as expected if the object structure is complex.
*   **Inline**:
    *   Pros:
        *   Can be more efficient, as it avoids method calls and array creations.
        *   Allows for direct property assignment, which can reduce memory allocation overhead.
    *   Cons:
        *   May lead to code complexity and readability issues if not used carefully.

**Other Considerations**

*   **Object Property Assignment**: When using `Object.assign()`, ensure that the source object is not modified externally, as this could affect performance. In contrast, inline assignment avoids this issue.
*   **Destructuring Complexity**: Be mindful of the complexity of your object structure when using destructuring. Simple cases work well, but more complex cases may lead to performance issues or unexpected behavior.

**Special JS Features or Syntax**
The benchmark uses the following JavaScript features:

*   **Destructuring (Deconstruct)**: Used in the "deconstruct" test case.
*   **Object Property Assignment**: Used in both `Object.assign()` and inline assignment tests.
*   **Async Code**: Not explicitly used, but it might be implied when using browser-specific timing functions like `ExecutionsPerSecond`.

**Alternatives**

If you're looking for alternative approaches or optimizations:

*   **Other Object Merge Methods**: Consider using the spread operator (`{ ... }`) or the `Object.assign()` method with a custom function for more complex merges.
*   **Performance-Optimized Code**: Experiment with code optimizations like memoization, caching, or using specialized libraries for array manipulation and object merging.

The benchmark provides valuable insights into the performance differences between these three approaches. By understanding the pros and cons of each method, you can make informed decisions about how to optimize your JavaScript code for specific use cases.

Related benchmarks:

Object.assign vs deconstruct vs inline (version: 0)

Comparing performance of: deconstruct vs Object.assign vs inline

Created: 4 years ago by: Guest

Jump to the latest result

deconstruct

Object.assign

inline

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):