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heron2014/useEffect-key-takeaways.js

Last active December 29, 2020 01:54
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Key takeaways for useEffect
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useEffect-key-takeaways.js
useEffect(fn) // run function on every render
useEffect(fn, []) // run function only when the component is first rendered
useEffect(fn, [value]) //run function when component is first rendered and when the `value` changes
// Remember if you pass dependency(value) which is an object - React perform
// strict comparision using "===" of the first level properties and will not
// conduct comparisons deeper into the properties.
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