Ivan Velasquez

Dec 5, 2018

Render Props vs State Hook

Ivan Velasquez

Dec 5, 2018

Render Props vs State Hook

Ivan Velasquez

Dec 5, 2018

Render Props vs State Hook

Ivan Velasquez

Dec 5, 2018

Render Props vs State Hook

Ivan Velasquez

Dec 5, 2018

Render Props vs State Hook

The term “render prop” refers to a technique used for sharing code between React components using a prop whose value is a function.

A component with a render prop takes a function that returns a React element and calls it instead of implementing its own render logic.

Let's create a component example that will help us to show/hide elements.

import React from 'react';
import PropTypes from 'prop-types';
import { defaultTo } from 'lodash';
class VisibilityHelper extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      isDisplayed: defaultTo(props.initialState, false),
    };
    this.hide = this.hide.bind(this);
    this.show = this.show.bind(this);
  }

  hide() {
    this.setState({
      isDisplayed: false,
    });
  }

  show() {
    this.setState({
      isDisplayed: true,
    });
  }

  render() {
    return this.props.children({
      ...this.state,
      hide: this.hide,
      show: this.show,
    });
  }
}

VisibilityHelper.propTypes = {
  initialState: PropTypes.bool,
  children: PropTypes.func.isRequired,
};
export default VisibilityHelper;

How can I use this component?

import VisibilityHelper from '..somewhere-inside-your-app';
const ButtonComponent = () =>  (
    <VisibilityHelper>
      {
        ({
           isDisplayed,
            hide,
            show
        }) => (
          <div>
            {
               isDisplayed &&
               <p onClick={hide}>Click to hide</p>
            }
            <button onClick={show}>Click to display</button>
          </div>
        )
      }
    </VisibilityHelper>
 );

This ButtonComponent will render a simple button that once clicked will change the isDisplayed property internally used on VisibilityHelper and show the hidden content.

I found render props useful in the kind of situation where we have a stateless component and there is no need to write a whole class.

React Hooks

According to the documentation, "Hooks are a new feature proposal that lets you use state and other React features without writing a class. They're currently in React v16.7.0-alpha and being discussed in an open RFC."

import { useState } from 'react';

const Example = () => {
  // Declare a new state variable, which we'll call "count"
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

As soon I started reading a feature's specification I knew exactly where to implement it on my react apps and I decided to write a blog post to share my knowledge

Replace render props with React Hooks.

Let’s rewrite the ConfirmationButton component replacing the VisibilityHelper with React Hooks.

import { useState } from 'react';
const ConfirmationButton = () => {
  const [isDisplayed, show] = useState(false);

  return (
    <div>
      {
        isDisplayed &&
        <p onClick={() => show(false)}>Click to hide</p>
      }
      <button onClick={() => show(true)}>Click to display</button>
    </div>
  );
}

Conclusion

React Hooks is not a replacement for Render props, there are more things that you can do with them, but in this case I think hooks is a good feature to use state properties inside a stateless component.

Render Props vs State Hook

The term “render prop” refers to a technique used for sharing code between React components using a prop whose value is a function.

A component with a render prop takes a function that returns a React element and calls it instead of implementing its own render logic.

Let's create a component example that will help us to show/hide elements.

import React from 'react';
import PropTypes from 'prop-types';
import { defaultTo } from 'lodash';
class VisibilityHelper extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      isDisplayed: defaultTo(props.initialState, false),
    };
    this.hide = this.hide.bind(this);
    this.show = this.show.bind(this);
  }

  hide() {
    this.setState({
      isDisplayed: false,
    });
  }

  show() {
    this.setState({
      isDisplayed: true,
    });
  }

  render() {
    return this.props.children({
      ...this.state,
      hide: this.hide,
      show: this.show,
    });
  }
}

VisibilityHelper.propTypes = {
  initialState: PropTypes.bool,
  children: PropTypes.func.isRequired,
};
export default VisibilityHelper;

How can I use this component?

import VisibilityHelper from '..somewhere-inside-your-app';
const ButtonComponent = () =>  (
    <VisibilityHelper>
      {
        ({
           isDisplayed,
            hide,
            show
        }) => (
          <div>
            {
               isDisplayed &&
               <p onClick={hide}>Click to hide</p>
            }
            <button onClick={show}>Click to display</button>
          </div>
        )
      }
    </VisibilityHelper>
 );

This ButtonComponent will render a simple button that once clicked will change the isDisplayed property internally used on VisibilityHelper and show the hidden content.

I found render props useful in the kind of situation where we have a stateless component and there is no need to write a whole class.

React Hooks

import { useState } from 'react';

const Example = () => {
  // Declare a new state variable, which we'll call "count"
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

As soon I started reading a feature's specification I knew exactly where to implement it on my react apps and I decided to write a blog post to share my knowledge

Replace render props with React Hooks.

Let’s rewrite the ConfirmationButton component replacing the VisibilityHelper with React Hooks.

import { useState } from 'react';
const ConfirmationButton = () => {
  const [isDisplayed, show] = useState(false);

  return (
    <div>
      {
        isDisplayed &&
        <p onClick={() => show(false)}>Click to hide</p>
      }
      <button onClick={() => show(true)}>Click to display</button>
    </div>
  );
}

Conclusion

Render Props vs State Hook

The term “render prop” refers to a technique used for sharing code between React components using a prop whose value is a function.

A component with a render prop takes a function that returns a React element and calls it instead of implementing its own render logic.

Let's create a component example that will help us to show/hide elements.

import React from 'react';
import PropTypes from 'prop-types';
import { defaultTo } from 'lodash';
class VisibilityHelper extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      isDisplayed: defaultTo(props.initialState, false),
    };
    this.hide = this.hide.bind(this);
    this.show = this.show.bind(this);
  }

  hide() {
    this.setState({
      isDisplayed: false,
    });
  }

  show() {
    this.setState({
      isDisplayed: true,
    });
  }

  render() {
    return this.props.children({
      ...this.state,
      hide: this.hide,
      show: this.show,
    });
  }
}

VisibilityHelper.propTypes = {
  initialState: PropTypes.bool,
  children: PropTypes.func.isRequired,
};
export default VisibilityHelper;

How can I use this component?

import VisibilityHelper from '..somewhere-inside-your-app';
const ButtonComponent = () =>  (
    <VisibilityHelper>
      {
        ({
           isDisplayed,
            hide,
            show
        }) => (
          <div>
            {
               isDisplayed &&
               <p onClick={hide}>Click to hide</p>
            }
            <button onClick={show}>Click to display</button>
          </div>
        )
      }
    </VisibilityHelper>
 );

This ButtonComponent will render a simple button that once clicked will change the isDisplayed property internally used on VisibilityHelper and show the hidden content.

I found render props useful in the kind of situation where we have a stateless component and there is no need to write a whole class.

React Hooks

import { useState } from 'react';

const Example = () => {
  // Declare a new state variable, which we'll call "count"
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

As soon I started reading a feature's specification I knew exactly where to implement it on my react apps and I decided to write a blog post to share my knowledge

Replace render props with React Hooks.

Let’s rewrite the ConfirmationButton component replacing the VisibilityHelper with React Hooks.

import { useState } from 'react';
const ConfirmationButton = () => {
  const [isDisplayed, show] = useState(false);

  return (
    <div>
      {
        isDisplayed &&
        <p onClick={() => show(false)}>Click to hide</p>
      }
      <button onClick={() => show(true)}>Click to display</button>
    </div>
  );
}

Conclusion

Render Props vs State Hook

The term “render prop” refers to a technique used for sharing code between React components using a prop whose value is a function.

A component with a render prop takes a function that returns a React element and calls it instead of implementing its own render logic.

Let's create a component example that will help us to show/hide elements.

import React from 'react';
import PropTypes from 'prop-types';
import { defaultTo } from 'lodash';
class VisibilityHelper extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      isDisplayed: defaultTo(props.initialState, false),
    };
    this.hide = this.hide.bind(this);
    this.show = this.show.bind(this);
  }

  hide() {
    this.setState({
      isDisplayed: false,
    });
  }

  show() {
    this.setState({
      isDisplayed: true,
    });
  }

  render() {
    return this.props.children({
      ...this.state,
      hide: this.hide,
      show: this.show,
    });
  }
}

VisibilityHelper.propTypes = {
  initialState: PropTypes.bool,
  children: PropTypes.func.isRequired,
};
export default VisibilityHelper;

How can I use this component?

import VisibilityHelper from '..somewhere-inside-your-app';
const ButtonComponent = () =>  (
    <VisibilityHelper>
      {
        ({
           isDisplayed,
            hide,
            show
        }) => (
          <div>
            {
               isDisplayed &&
               <p onClick={hide}>Click to hide</p>
            }
            <button onClick={show}>Click to display</button>
          </div>
        )
      }
    </VisibilityHelper>
 );

This ButtonComponent will render a simple button that once clicked will change the isDisplayed property internally used on VisibilityHelper and show the hidden content.

I found render props useful in the kind of situation where we have a stateless component and there is no need to write a whole class.

React Hooks

import { useState } from 'react';

const Example = () => {
  // Declare a new state variable, which we'll call "count"
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

As soon I started reading a feature's specification I knew exactly where to implement it on my react apps and I decided to write a blog post to share my knowledge

Replace render props with React Hooks.

Let’s rewrite the ConfirmationButton component replacing the VisibilityHelper with React Hooks.

import { useState } from 'react';
const ConfirmationButton = () => {
  const [isDisplayed, show] = useState(false);

  return (
    <div>
      {
        isDisplayed &&
        <p onClick={() => show(false)}>Click to hide</p>
      }
      <button onClick={() => show(true)}>Click to display</button>
    </div>
  );
}

Conclusion

Render Props vs State Hook

The term “render prop” refers to a technique used for sharing code between React components using a prop whose value is a function.

A component with a render prop takes a function that returns a React element and calls it instead of implementing its own render logic.

Let's create a component example that will help us to show/hide elements.

import React from 'react';
import PropTypes from 'prop-types';
import { defaultTo } from 'lodash';
class VisibilityHelper extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      isDisplayed: defaultTo(props.initialState, false),
    };
    this.hide = this.hide.bind(this);
    this.show = this.show.bind(this);
  }

  hide() {
    this.setState({
      isDisplayed: false,
    });
  }

  show() {
    this.setState({
      isDisplayed: true,
    });
  }

  render() {
    return this.props.children({
      ...this.state,
      hide: this.hide,
      show: this.show,
    });
  }
}

VisibilityHelper.propTypes = {
  initialState: PropTypes.bool,
  children: PropTypes.func.isRequired,
};
export default VisibilityHelper;

How can I use this component?

import VisibilityHelper from '..somewhere-inside-your-app';
const ButtonComponent = () =>  (
    <VisibilityHelper>
      {
        ({
           isDisplayed,
            hide,
            show
        }) => (
          <div>
            {
               isDisplayed &&
               <p onClick={hide}>Click to hide</p>
            }
            <button onClick={show}>Click to display</button>
          </div>
        )
      }
    </VisibilityHelper>
 );

This ButtonComponent will render a simple button that once clicked will change the isDisplayed property internally used on VisibilityHelper and show the hidden content.

I found render props useful in the kind of situation where we have a stateless component and there is no need to write a whole class.

React Hooks

import { useState } from 'react';

const Example = () => {
  // Declare a new state variable, which we'll call "count"
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

As soon I started reading a feature's specification I knew exactly where to implement it on my react apps and I decided to write a blog post to share my knowledge

Replace render props with React Hooks.

Let’s rewrite the ConfirmationButton component replacing the VisibilityHelper with React Hooks.

import { useState } from 'react';
const ConfirmationButton = () => {
  const [isDisplayed, show] = useState(false);

  return (
    <div>
      {
        isDisplayed &&
        <p onClick={() => show(false)}>Click to hide</p>
      }
      <button onClick={() => show(true)}>Click to display</button>
    </div>
  );
}