Benchmark: Test UseRef Sagar

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 = {
    a: "hello",
    b: "world"
}


function UseMemoAlone(props) {
    const handler = React.useMemo(() => {
        return {
            ...a,
            c: "!!"
        }
    }, []);
    return React.createElement(ChildComponent, {
        className: handler.toString()
    });
}

function NoMemo(props) {
    const handler = {
        ...a,
        c: "!!"
    };
    return React.createElement(ChildComponent, {
        className: handler.toString()
    });
}

function UseRefAlone(props) {
    const handler = React.useRef({
        ...a,
        c: "!!"
    });
    return React.createElement(ChildComponent, {
        className: handler.current.toString()
    });
}

var propCases = [{
    handler: function() {
        return Math.random();
    },
    wait: 100
}, {
    handler: function() {
        return Math.random();
    },
    wait: 200
}, {
    handler: function() {
        return Math.random();
    },
    wait: 300
}];
propCases.push(propCases[1]);

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
No useMemo
useMemo
useRef

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:127.0) Gecko/20100101 Firefox/127.0

Browser/OS: Firefox 127 on Mac OS X 10.15

View result in a separate tab

No useMemo

11K/s

useMemo

10K/s

useRef

9K/s

View exact numbers

Test name	Executions per second
✓ No useMemo	10,897 Ops/sec
useMemo	9,943 Ops/sec
useRef	9,381 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Explanation**

The provided benchmark is designed to compare the performance of three different approaches in React.js: `UseMemo`, `UseRef`, and not using memoization or ref at all (`NoMemo`).

**Options Compared**

1. **UseMemo**: This approach uses the `React.useMemo` hook to memoize a function that returns an object with properties from `a` and another property `c`. The function is only recreated when `props` change, and its result is cached.
2. **UseRef**: This approach uses the `React.createRef` method to create a reference variable that holds a value. In this case, the initial value is set to an object with properties from `a` and another property `c`. When `props` change, the function is called again, but since the ref's current value hasn't changed, it doesn't re-run.
3. **NoMemo**: This approach does not use memoization or ref at all. It simply returns a new object with properties from `a` and another property `c`, every time `props` change.

**Pros and Cons**

* **UseMemo**:
	+ Pros: Easy to implement, reduces unnecessary re-renders.
	+ Cons: Can lead to performance issues if the memoized function is computationally expensive or has a complex dependency list.
* **UseRef**:
	+ Pros: Can be more efficient than `useMemo` when dealing with simple dependencies, as it only runs when the ref's value changes.
	+ Cons: Requires manual management of the ref's current value, which can lead to bugs if not done correctly.
* **NoMemo**:
	+ Pros: Simple and straightforward approach.
	+ Cons: Can lead to unnecessary re-renders, especially if the component has many dependencies.

**Library Usage**

The benchmark uses `lodash` as a dependency. While it's not directly related to React or memoization, its presence might affect performance due to additional function calls.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax mentioned in this benchmark. The code is straightforward and uses standard JavaScript features like functions, objects, and arrays.

**Alternatives**

Other approaches for memoization in React include:

1. `React.useCallback`: Memoizes a function, which can be useful when the dependency list is short.
2. `React.useImperativeHandle`: Memoizes a handle, which can be used to improve performance when dealing with complex dependencies.
3. Custom hooks: Developers can create their own custom hooks using `React.createHook` and memoize data or functions accordingly.

Keep in mind that each approach has its trade-offs, and the choice of which one to use depends on the specific requirements and constraints of your project.

Test UseRef Sagar (version: 0)

Comparing performance of: `No useMemo vs useMemo vs useRef`

Created: 2 years ago by: Guest

Go to the latest result

No useMemo

useMemo

useRef

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Test UseRef Sagar (version: 0)

Comparing performance of: No useMemo vs useMemo vs useRef

Created: 2 years ago by: Guest

Go to the latest result

No useMemo

useMemo

useRef

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `No useMemo vs useMemo vs useRef`