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What is the usage of refs and keys used in React?

This thread contains 1 reply, has 2 voices, and was last updated by  darshan.soni007 7 months ago.

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  • #51973

    What is the usage of refs and keys used in React?


  • #51975

    The ref is used to return a reference to your element. Refs should be avoided in most cases but they can be useful when you need DOM measurements or to add methods to your components.

    React keys are useful when working with dynamically created components or when your lists are altered by users. Setting the key value will keep your components uniquely identified after the change.

    render () {
    return (

      {this.state.todoItems.map(({task, uid}) => {
      return <li key={uid}>{task}
      })}

    )
    }


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