sandpack | component toolkit | Frontend Framework library
kandi X-RAY | sandpack Summary
kandi X-RAY | sandpack Summary
Sandpack is a component toolkit for creating your own live running code editing experience powered by CodeSandbox.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of sandpack
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QUESTION
By default, React preserves state of a component while it stays at the same position. Usually, this is exactly what you want, so it makes sense as the default behavior.
Examples are taken from the new React docs.
Example 1 - the same position
, codesandbox, (relevant code) :
ANSWER
Answered 2021-Dec-07 at 02:29In the first example, both Counter will preserve the same state because the are rendered one at a time in the same exact position in DOM Tree. React thinks they are the same because the position. Latter by definition, Counter Taylor and Sarah are rendered at different location in DOM Tree. Therefore react thinks they are different and give them their own state.
Another option which produce same result as the second example is option 2 where even though they are switched in the same position, they have different keys therefore considered different.
Remember, react only sees component in DOM Tree and preserve their states only if they are rendered.
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