How can I bind function with hooks in React?










0















Basically we bind event handler functions in constructor or make them as arrow functions in React class components like below



class Test extends Component
constructor(props)
super(props);
this.state = count:0 ;
this.setCount = this.setCount.bind(this);


setCount()
this.setState(count: this.state.count + 1);


render()
return <button onClick=this.setCount>Increase</button>




But after hooks are introduced in React v16.7.0 the class components became functional components with state.



So how can I bind the function with hooks in functional component?










share|improve this question



















  • 2





    There is no need to bind the function in a function component since you are not using this.

    – Tholle
    Nov 8 '18 at 19:49











  • you don't need if you use the arrow function

    – victor zadorozhnyy
    Nov 8 '18 at 19:50











  • Ok what if I use Redux connect method with mapStateToProps. How can I access props in functional component like this.props or just props?

    – Hemadri Dasari
    Nov 8 '18 at 20:02






  • 1





    You just use props ... not this.props

    – weibenfalk
    Nov 8 '18 at 20:08















0















Basically we bind event handler functions in constructor or make them as arrow functions in React class components like below



class Test extends Component
constructor(props)
super(props);
this.state = count:0 ;
this.setCount = this.setCount.bind(this);


setCount()
this.setState(count: this.state.count + 1);


render()
return <button onClick=this.setCount>Increase</button>




But after hooks are introduced in React v16.7.0 the class components became functional components with state.



So how can I bind the function with hooks in functional component?










share|improve this question



















  • 2





    There is no need to bind the function in a function component since you are not using this.

    – Tholle
    Nov 8 '18 at 19:49











  • you don't need if you use the arrow function

    – victor zadorozhnyy
    Nov 8 '18 at 19:50











  • Ok what if I use Redux connect method with mapStateToProps. How can I access props in functional component like this.props or just props?

    – Hemadri Dasari
    Nov 8 '18 at 20:02






  • 1





    You just use props ... not this.props

    – weibenfalk
    Nov 8 '18 at 20:08













0












0








0


0






Basically we bind event handler functions in constructor or make them as arrow functions in React class components like below



class Test extends Component
constructor(props)
super(props);
this.state = count:0 ;
this.setCount = this.setCount.bind(this);


setCount()
this.setState(count: this.state.count + 1);


render()
return <button onClick=this.setCount>Increase</button>




But after hooks are introduced in React v16.7.0 the class components became functional components with state.



So how can I bind the function with hooks in functional component?










share|improve this question
















Basically we bind event handler functions in constructor or make them as arrow functions in React class components like below



class Test extends Component
constructor(props)
super(props);
this.state = count:0 ;
this.setCount = this.setCount.bind(this);


setCount()
this.setState(count: this.state.count + 1);


render()
return <button onClick=this.setCount>Increase</button>




But after hooks are introduced in React v16.7.0 the class components became functional components with state.



So how can I bind the function with hooks in functional component?







javascript reactjs react-native react-hooks






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 12 '18 at 15:47







Hemadri Dasari

















asked Nov 8 '18 at 19:45









Hemadri DasariHemadri Dasari

8,30411440




8,30411440







  • 2





    There is no need to bind the function in a function component since you are not using this.

    – Tholle
    Nov 8 '18 at 19:49











  • you don't need if you use the arrow function

    – victor zadorozhnyy
    Nov 8 '18 at 19:50











  • Ok what if I use Redux connect method with mapStateToProps. How can I access props in functional component like this.props or just props?

    – Hemadri Dasari
    Nov 8 '18 at 20:02






  • 1





    You just use props ... not this.props

    – weibenfalk
    Nov 8 '18 at 20:08












  • 2





    There is no need to bind the function in a function component since you are not using this.

    – Tholle
    Nov 8 '18 at 19:49











  • you don't need if you use the arrow function

    – victor zadorozhnyy
    Nov 8 '18 at 19:50











  • Ok what if I use Redux connect method with mapStateToProps. How can I access props in functional component like this.props or just props?

    – Hemadri Dasari
    Nov 8 '18 at 20:02






  • 1





    You just use props ... not this.props

    – weibenfalk
    Nov 8 '18 at 20:08







2




2





There is no need to bind the function in a function component since you are not using this.

– Tholle
Nov 8 '18 at 19:49





There is no need to bind the function in a function component since you are not using this.

– Tholle
Nov 8 '18 at 19:49













you don't need if you use the arrow function

– victor zadorozhnyy
Nov 8 '18 at 19:50





you don't need if you use the arrow function

– victor zadorozhnyy
Nov 8 '18 at 19:50













Ok what if I use Redux connect method with mapStateToProps. How can I access props in functional component like this.props or just props?

– Hemadri Dasari
Nov 8 '18 at 20:02





Ok what if I use Redux connect method with mapStateToProps. How can I access props in functional component like this.props or just props?

– Hemadri Dasari
Nov 8 '18 at 20:02




1




1





You just use props ... not this.props

– weibenfalk
Nov 8 '18 at 20:08





You just use props ... not this.props

– weibenfalk
Nov 8 '18 at 20:08












1 Answer
1






active

oldest

votes


















3














There's no need to bind functions/callbacks in functional components since there's no this in functions. In classes, it was important to bind this because we want to ensure that the this in the callbacks referred to the component's instance itself. However, doing .bind in the constructor has another useful property of creating the functions once during the entire lifecycle of the component and a new callback wasn't created in every call of render(). To do only initialize the callback once using React hooks, you would use useCallback.



Classes



class Foo extends Component 
constructor(props)
super(props);
this.handleClick = this.handleClick.bind(this);


handleClick()
console.log('Click happened');


render()
return <Button onClick=this.handleClick>Click Me</Button>;




Hooks



function Foo() 
const memoizedHandleClick = useCallback(
() =>
console.log('Click happened');
,
, // Tells React to memoize regardless of arguments.
);
return <Button onClick=memoizedHandleClick>Click Me</Button>;






share|improve this answer























  • Thank you. Can’t I write event handler function like const memoizedHandleClick = () => console.log('Click happened'); ?

    – Hemadri Dasari
    Nov 12 '18 at 15:49






  • 1





    @Think-Twice yes, you can. But it will recreate handler on each render(the same as using arrow functions in class-based render()).

    – skyboyer
    Nov 12 '18 at 15:58











  • Ok what is useCallback? Is it predefined name?

    – Hemadri Dasari
    Nov 12 '18 at 15:59











  • Yes it's another hook. Have you read the docs? You should check out the whole section on hooks: reactjs.org/docs/hooks-intro.html

    – Yangshun Tay
    Nov 12 '18 at 18:13










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1 Answer
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oldest

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1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









3














There's no need to bind functions/callbacks in functional components since there's no this in functions. In classes, it was important to bind this because we want to ensure that the this in the callbacks referred to the component's instance itself. However, doing .bind in the constructor has another useful property of creating the functions once during the entire lifecycle of the component and a new callback wasn't created in every call of render(). To do only initialize the callback once using React hooks, you would use useCallback.



Classes



class Foo extends Component 
constructor(props)
super(props);
this.handleClick = this.handleClick.bind(this);


handleClick()
console.log('Click happened');


render()
return <Button onClick=this.handleClick>Click Me</Button>;




Hooks



function Foo() 
const memoizedHandleClick = useCallback(
() =>
console.log('Click happened');
,
, // Tells React to memoize regardless of arguments.
);
return <Button onClick=memoizedHandleClick>Click Me</Button>;






share|improve this answer























  • Thank you. Can’t I write event handler function like const memoizedHandleClick = () => console.log('Click happened'); ?

    – Hemadri Dasari
    Nov 12 '18 at 15:49






  • 1





    @Think-Twice yes, you can. But it will recreate handler on each render(the same as using arrow functions in class-based render()).

    – skyboyer
    Nov 12 '18 at 15:58











  • Ok what is useCallback? Is it predefined name?

    – Hemadri Dasari
    Nov 12 '18 at 15:59











  • Yes it's another hook. Have you read the docs? You should check out the whole section on hooks: reactjs.org/docs/hooks-intro.html

    – Yangshun Tay
    Nov 12 '18 at 18:13















3














There's no need to bind functions/callbacks in functional components since there's no this in functions. In classes, it was important to bind this because we want to ensure that the this in the callbacks referred to the component's instance itself. However, doing .bind in the constructor has another useful property of creating the functions once during the entire lifecycle of the component and a new callback wasn't created in every call of render(). To do only initialize the callback once using React hooks, you would use useCallback.



Classes



class Foo extends Component 
constructor(props)
super(props);
this.handleClick = this.handleClick.bind(this);


handleClick()
console.log('Click happened');


render()
return <Button onClick=this.handleClick>Click Me</Button>;




Hooks



function Foo() 
const memoizedHandleClick = useCallback(
() =>
console.log('Click happened');
,
, // Tells React to memoize regardless of arguments.
);
return <Button onClick=memoizedHandleClick>Click Me</Button>;






share|improve this answer























  • Thank you. Can’t I write event handler function like const memoizedHandleClick = () => console.log('Click happened'); ?

    – Hemadri Dasari
    Nov 12 '18 at 15:49






  • 1





    @Think-Twice yes, you can. But it will recreate handler on each render(the same as using arrow functions in class-based render()).

    – skyboyer
    Nov 12 '18 at 15:58











  • Ok what is useCallback? Is it predefined name?

    – Hemadri Dasari
    Nov 12 '18 at 15:59











  • Yes it's another hook. Have you read the docs? You should check out the whole section on hooks: reactjs.org/docs/hooks-intro.html

    – Yangshun Tay
    Nov 12 '18 at 18:13













3












3








3







There's no need to bind functions/callbacks in functional components since there's no this in functions. In classes, it was important to bind this because we want to ensure that the this in the callbacks referred to the component's instance itself. However, doing .bind in the constructor has another useful property of creating the functions once during the entire lifecycle of the component and a new callback wasn't created in every call of render(). To do only initialize the callback once using React hooks, you would use useCallback.



Classes



class Foo extends Component 
constructor(props)
super(props);
this.handleClick = this.handleClick.bind(this);


handleClick()
console.log('Click happened');


render()
return <Button onClick=this.handleClick>Click Me</Button>;




Hooks



function Foo() 
const memoizedHandleClick = useCallback(
() =>
console.log('Click happened');
,
, // Tells React to memoize regardless of arguments.
);
return <Button onClick=memoizedHandleClick>Click Me</Button>;






share|improve this answer













There's no need to bind functions/callbacks in functional components since there's no this in functions. In classes, it was important to bind this because we want to ensure that the this in the callbacks referred to the component's instance itself. However, doing .bind in the constructor has another useful property of creating the functions once during the entire lifecycle of the component and a new callback wasn't created in every call of render(). To do only initialize the callback once using React hooks, you would use useCallback.



Classes



class Foo extends Component 
constructor(props)
super(props);
this.handleClick = this.handleClick.bind(this);


handleClick()
console.log('Click happened');


render()
return <Button onClick=this.handleClick>Click Me</Button>;




Hooks



function Foo() 
const memoizedHandleClick = useCallback(
() =>
console.log('Click happened');
,
, // Tells React to memoize regardless of arguments.
);
return <Button onClick=memoizedHandleClick>Click Me</Button>;







share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 11 '18 at 5:55









Yangshun TayYangshun Tay

9,27853867




9,27853867












  • Thank you. Can’t I write event handler function like const memoizedHandleClick = () => console.log('Click happened'); ?

    – Hemadri Dasari
    Nov 12 '18 at 15:49






  • 1





    @Think-Twice yes, you can. But it will recreate handler on each render(the same as using arrow functions in class-based render()).

    – skyboyer
    Nov 12 '18 at 15:58











  • Ok what is useCallback? Is it predefined name?

    – Hemadri Dasari
    Nov 12 '18 at 15:59











  • Yes it's another hook. Have you read the docs? You should check out the whole section on hooks: reactjs.org/docs/hooks-intro.html

    – Yangshun Tay
    Nov 12 '18 at 18:13

















  • Thank you. Can’t I write event handler function like const memoizedHandleClick = () => console.log('Click happened'); ?

    – Hemadri Dasari
    Nov 12 '18 at 15:49






  • 1





    @Think-Twice yes, you can. But it will recreate handler on each render(the same as using arrow functions in class-based render()).

    – skyboyer
    Nov 12 '18 at 15:58











  • Ok what is useCallback? Is it predefined name?

    – Hemadri Dasari
    Nov 12 '18 at 15:59











  • Yes it's another hook. Have you read the docs? You should check out the whole section on hooks: reactjs.org/docs/hooks-intro.html

    – Yangshun Tay
    Nov 12 '18 at 18:13
















Thank you. Can’t I write event handler function like const memoizedHandleClick = () => console.log('Click happened'); ?

– Hemadri Dasari
Nov 12 '18 at 15:49





Thank you. Can’t I write event handler function like const memoizedHandleClick = () => console.log('Click happened'); ?

– Hemadri Dasari
Nov 12 '18 at 15:49




1




1





@Think-Twice yes, you can. But it will recreate handler on each render(the same as using arrow functions in class-based render()).

– skyboyer
Nov 12 '18 at 15:58





@Think-Twice yes, you can. But it will recreate handler on each render(the same as using arrow functions in class-based render()).

– skyboyer
Nov 12 '18 at 15:58













Ok what is useCallback? Is it predefined name?

– Hemadri Dasari
Nov 12 '18 at 15:59





Ok what is useCallback? Is it predefined name?

– Hemadri Dasari
Nov 12 '18 at 15:59













Yes it's another hook. Have you read the docs? You should check out the whole section on hooks: reactjs.org/docs/hooks-intro.html

– Yangshun Tay
Nov 12 '18 at 18:13





Yes it's another hook. Have you read the docs? You should check out the whole section on hooks: reactjs.org/docs/hooks-intro.html

– Yangshun Tay
Nov 12 '18 at 18:13

















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