each child in a list should have a unique 22key 22 prop

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showing results for - "each child in a list should have a unique 22key 22 prop "
Emilio
28 Oct 2018
1<ul>
2  {["Item1", "Item2", "Item3"].map(item =>
3  <li key="{item}">{item}</li>
4  )}
5</ul>
6
Lilly
03 Oct 2019
1const numbers = [1, 2, 3, 4, 5];
2const listItems = numbers.map((number) =>
3  <li key={number.toString()}>    {number}
4  </li>
5);
Linus
13 Jan 2017
1<ul>
2  {["Item1", "Item2", "Item3"].map(item =>
3  <li>{item}</li>
4  )}
5</ul>
6
Royce
15 Apr 2018
1When creating a list in the UI from an array with JSX, you should add a key prop to each child and to any of its’ children.
2
3Ex: <li key="uniqueId1" >Item1</li>
4
5React uses the key prop create a relationship between the component and the DOM element. The library uses this relationship to determine whether or not the component should be re-rendered.
6
7It is not recommended to use the index of the array as the key prop if you know the array will not be static. If the key is an index, reordering an item in the array changes it. Then React will get confused and re-render the incorrect element.
8
9<--Important-->
10Keys do not have to be unique globally. They just need to be unique across sibling elements.
11
12<ul>
13  {["Item1", "Item2", "Item3"].map(item =>
14  <li key="{item}">{item}</li>
15  )}
16</ul>
Hannah
12 Jan 2021
1<ul>
2  {["Item1", "Item2", "Item3"].map(item =>
3  <li key="{item}">{item}</li>
4  )}
5</ul>
Lya
24 Jan 2021
1Warning: Each child in a list should have a unique "key" prop
2
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