react-optimization-tools

react-optimization-tools

Set of the fastest tools for optimizing the work of a React application

$3

npm install --save react-optimization-tools

$3

The set includes eight algorithms:

four functions:

- memoDeep

- memoizeDeep

- compareDeep

- staticCallback

and four hooks:

- useMemoDeep / useMemoDeepSE

- useCallbackDeep / useCallbackDeepSE

- useEffectDeep

- useEvent

#### 1. memoDeep

If the props are not changed, the component is not rendered. Analog React.memo but with deep comparison.

Example of use:

``javascript
import React from 'react';
import { memoDeep } from 'react-optimization-tools';

const Component = (props) => {...};
export default memoDeep(Component);
`

#### 2. memoizeDeep

Remembers the last result of the function. Analog memoize-one but with deep comparison and better performance. Based on project deepMemoizeOnce.

Example of use:

- 2.1.

`javascript
import { memoizeDeep } from 'react-optimization-tools';

const memoFunc = memoizeDeep((arg) => {...}); // heavy computation function

const mapStateToProps = ({ data }) => {
return {
propValue: memoFunc(data)
}}
`

- 2.2. (reselect)

`javascript
import { createSelectorCreator } from 'reselect';
import { memoizeDeep } from 'react-optimization-tools';

const customSelectorCreator = createSelectorCreator(memoizeDeep);
// or
const customSelectorCreator = createSelectorCreator(memoizeDeep, true); // clone the arguments of the function
// or
const customSelectorCreator = createSelectorCreator(memoizeDeep, { circular: true, strict: true }); // customizable cloning of the arguments of the function

const selector = customSelectorCreator(
state => state.a,
state => state.b,
(a, b) => {...}
);
`

#### 3. compareDeep

Function of fast deep comparison of two values.

Example of use:

- 3.1. (reselect)

`javascript
import { createSelectorCreator, defaultMemoize } from 'reselect';
import { compareDeep } from 'react-optimization-tools';

const createDeepEqualSelector = createSelectorCreator(
defaultMemoize,
compareDeep
)

const mySelector = createDeepEqualSelector(
state => state.a,
values => {...}
)
`

- 3.2. (React.memo)

`javascript
import React from "react";
import { compareDeep } from "react-optimization-tools";

const MemoComponent = React.memo(Component, compareDeep);
// or
export default React.memo(Component, compareDeep);
`

- 3.3. (shouldComponentUpdate)

`javascript
import React from 'react';
import { compareDeep } from 'react-optimization-tools';

class Component extends React.Component {
shouldComponentUpdate(nextProps) {
return !compareDeep(this.props, nextProps);
}
render() {...}
}
`

#### 4. useMemoDeep

Hook for memoizing the result of the function with unchanged values of the input parameters. Similar to useMemo, but with a deep comparison.
The arguments of the hook: useMemoDeep(function, dependencies, isCloneProps = false)

Example of use:

`javascript
import React, { useState } from 'react';
import { useMemoDeep } from 'react-optimization-tools';

const Component = () => {
const [ count, setCount ] = useState(0);

// ! attention is memoized result of the function !
const res = useMemoDeep(() => {...}, [count]);

return(...)
}
`

The documentation of the React says: "Remember that the function passed to useMemo runs during rendering. Don’t do anything there that you wouldn’t normally do while rendering. For example, side effects belong in useEffect, not useMemo." Like here:

`javascript
const [count, setCount] = useState(0);

const value = useMemoDeep(() => {
const res = count + 10;

setState(res);

return res;
}, [def]);
`

But if you need to use with side effects, then use the SE version - useMemoDeepSE

#### 5. useCallbackDeep

Hook for memoizing a reference to a function with unchanged values of input parameters. Similar to useCallback, but with a deep comparison.
The arguments of the hook: useCallbackDeep(function, dependencies, isCloneProps = false)

useCallbackDeepSE - version for side effects(explained above)

Example of use:

`javascript
import React, { useState } from 'react';
import { useCallbackDeep } from 'react-optimization-tools';

const Component = () => {
const [ count, setCount ] = useState(0);

// ! attention is memoized function reference !
const funcRef = useCallbackDeep(() => {...}, [count]);

return(...)
}
`

#### 6. useEffectDeep

Similar to useEffect, but with a deep comparison.


#### 7. useEvent

The callback in the useEvent will always have access to the current state/props, while having a static link and without the transmission of dependencies.

Example of use:

`javascript
const Component = () => {
const [value, setValue] = useState(0);

const onClick = useEvent(() => {
console.log(value);
});

return (

;

);
}
`

#### 8. staticCallback

Function for memoizing a reference to a function with unchanged values of input parameters. Similar to useCallbackDeep, but for class components. Used in cases when it is difficult to create functions in the main definition of the class, as in the example below.
The arguments of the function: staticCallback(context, function, key, dependencies = [], isCloneProps = false)

Example of use:

`javascript
import React, { PureComponent } from "react";
import { staticCallback } from "react-optimization-tools";
import GalleryItem from "./components/GalleryItem";

class Gallery extends PureComponent {
sc = (fn, key, props) => staticCallback(this, fn, key, props);

render() {
const {
sc,
props: { items },
} = this;
return (

);
}
}
`

$3

The algorithms are based on the speed of the modified algorithm of the qcompare project. The modification was related to the ability to work with React components. Therefore, the performance of this algorithm was compared with similar projects. Performance tests were used from these projects.

`
Nodejs - v14.9.0
Date - 14.10.2020
`

react-fast-compare project test result

`
--- speed tests: generic usage ---
qcompare x 140,332 ops/sec ±0.44% (92 runs sampled)
react-fast-compare x 97,891 ops/sec ±1.27% (88 runs sampled)
fast-deep-equal x 94,725 ops/sec ±1.04% (90 runs sampled)
lodash.isEqual x 16,635 ops/sec ±24.04% (91 runs sampled)
nano-equal x 93,555 ops/sec ±0.27% (90 runs sampled)
shallow-equal-fuzzy x 54,279 ops/sec ±0.43% (89 runs sampled)
fastest: qcompare

--- speed tests: generic and react ---
qcompare x 64,123 ops/sec ±0.59% (88 runs sampled)
react-fast-compare x 44,744 ops/sec ±0.70% (88 runs sampled)
fast-deep-equal x 33,168 ops/sec ±0.37% (89 runs sampled)
lodash.isEqual x 3,085 ops/sec ±10.04% (87 runs sampled)
fastest: qcompare
``

$3

MIT Yuriy Khomenko