Dynamic Key Generation In Map Function React

admin
  • ReactJS Tutorial
  • ReactJS Useful Resources
  • Selected Reading

Aug 27, 2015 It will cause you (or the next poor soul after you) much pain and suffering. The engineers behind Revelry’s custom software development use React and write about it often. Check out this post on React testing with Jasmine, dive into React and ECMAScript 6, or learn more about using Google Maps with React. A “key” is a special string attribute you need to include when creating lists of elements in React. Keys are used in React to identify which items in the list are changed, updated or deleted. In other words we can say that keys are used to give an indentity to the elements in the lists.


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

Using Keys

Let's dynamically create Content elements with unique index (i). The map function will create three elements from our data array. Since the key value needs to be unique for every element, we will assign i as a key for each created element.

App.jsx

main.js

We will get the following result for the Key values of each element.

If we add or remove some elements in the future or change the order of the dynamically created elements, React will use the key values to keep track of each element. /avast-antivirus-2016-key-generator.html.

  • ReactJS Tutorial
  • ReactJS Useful Resources
  • Selected Reading

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

Using Keys

Let's dynamically create Content elements with unique index (i). The map function will create three elements from our data array. Since the key value needs to be unique for every element, we will assign i as a key for each created element.

App.jsx

Dynamic Key Generation In Map Function Reaction

main.js

We will get the following result for the Key values of each element.

Dynamic Key Generation In Map Function React Crossword

If we add or remove some elements in the future or change the order of the dynamically created elements, React will use the key values to keep track of each element.