Benchmark: useMemo and memoa test

HTML Preparation code:

<div id="root"></div>

<script src="https://unpkg.com/react@16/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.15/lodash.min.js"></script>

Script Preparation code:

function ChildComponent(props) {
    return React.createElement("div", props);
}

const a = {
    width: "4px",
    height: "5px"
}


function UseMemoAlone(props) {
    const handler = React.useMemo(() => {
        return {
            ...a,
            background: "black"
        }
    }, []);
    return React.createElement(ChildComponent, {
        style: handler
    });
}

function NoMemo(props) {
    const handler = {
        ...a,
        background: "black"
    };
    return React.createElement(ChildComponent, {
        style: handler
    });
}

var propCases = [{
    handler: function() {
        return Math.random();
    },
    wait: 100
}, {
    handler: function() {
        return Math.random();
    },
    wait: 200
}];
propCases.push(propCases[1]);

Tests:

No Memo
propCases.forEach((props) => { ReactDOM.render(React.createElement(NoMemo, props, null), root); });
UseMemoAlone
propCases.forEach((props) => { ReactDOM.render(React.createElement(UseMemoAlone, props, null), root); });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
No Memo
UseMemoAlone

Fastest: N/A

Slowest: N/A

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/128.0.0.0 Safari/537.36

Browser/OS: Chrome 128 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
No Memo	19168.0 Ops/sec
UseMemoAlone	18891.8 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring the performance of React components with and without `useMemo` can be a useful benchmark for understanding the benefits of memoization in JavaScript applications.

**Benchmark Test**

The provided JSON represents a test case that compares two approaches: `UseMemoAlone` and `NoMemo`. The difference between these two approaches lies in how the `background` style property is computed and assigned to the component.

1.  **NoMemo**: In this approach, the `background` style property is assigned directly to the `handler` object without using memoization. The `handler` object is recreated on every render, which can lead to performance issues if the computation of the `background` property is expensive.
2.  **UseMemoAlone**: This approach uses `useMemo` hook to memoize the computation of the `background` style property. The `useMemo` hook allows React to cache the result of the computation and reuse it on subsequent renders, which can improve performance.

**Options Compared**

The main options being compared are:

*   **UseMemoAlone**: This approach uses the `useMemo` hook to memoize the computation of the `background` style property.
*   **NoMemo**: This approach does not use memoization and computes the `background` style property directly on every render.

**Pros and Cons**

**UseMemoAlone**

Pros:

*   Improved performance by avoiding unnecessary computations
*   Reduced memory usage by caching intermediate results

Cons:

*   Additional overhead due to the use of the `useMemo` hook
*   May introduce additional complexity in component implementation

**NoMemo**

Pros:

*   Simplified component implementation with less dependencies on React hooks
*   No additional overhead or complexity

Cons:

*   Potential performance issues if computations are expensive
*   Increased memory usage due to the creation of intermediate results

**Other Considerations**

1.  **Libraries and Dependencies**: The test case uses the `lodash` library, which is a utility library that provides various helper functions for tasks such as array manipulation and string processing.
2.  **JS Features and Syntax**: This benchmark does not explicitly use any special JavaScript features or syntax, but it relies on the `useMemo` hook, which is a modern feature introduced in React 16.

**Alternatives**

There are alternative approaches to memoization, including:

1.  **Manual caching**: Implementing manual caching mechanisms using objects or other data structures to store intermediate results.
2.  **React.memo**: Using the `react.memo` function to memoize components based on their props.
3.  **Other optimization techniques**: Applying other optimization techniques such as code splitting, tree shaking, and dead code elimination to improve performance.

In conclusion, measuring the performance of React components with and without `useMemo` can provide valuable insights into the benefits of memoization in JavaScript applications. By understanding the pros and cons of different approaches, developers can make informed decisions about when to use memoization to optimize their application's performance.

Related benchmarks:

useMemo and memoa test (version: 0)

Comparing performance of: No Memo vs UseMemoAlone

Created: one year ago by: Guest

Jump to the latest result

No Memo

UseMemoAlone

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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