Keys in Rendering List in React | keys in react

Keys in Rendering List in React | keys in react

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Welcome to this video from tutorialsinhand.com. In this video we are going to discuss on keys in rendering lists in react.

Rendering Lists in React
List is a pretty important data structure in any programming language. It helps us in handling mutable data and push items or remove items from it. In React, lists are used mainly to render a HTML element repetitively to show some data. For example, if from an API we have got 4 objects which contains some data, we can render it on UI, using the same “div” element, just by iterating on it and passing different data as props to it.


A “key” is a special string attribute which is needed to be included while creating lists of elements. If developers, miss setting up the key attribute, something like this might be shown in the console: Warning: Each child in a list should have a unique “key” prop. This is so because while rendering lists in react using the map() method as discussed in the previous article, we are supposed to pass a prop called “key”, and the value of that props is required to be unique among the list of items.


Example: Products page in ecommerce website.

Important timeline
React keys theoretical explanation: 00:00
React keys code explanation: 04:50


Article URL: Yet to Publish

Rendering Lists in React: https://youtu.be/6biorOtkDEw

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