react run useeffect only once
useEffect(() => {
// Initialization code comes here
}, []);react run useeffect only once
useEffect(() => {
// Initialization code comes here
}, []);running useeffect only once react native
useEffect(() => {
// This will run only once when the component mounts
}, []);
Explaination useEffect vs. componentDidMount
componentDidMount became a popular lifecycle function in class components
because it was the ideal way to fetch data for the component. This is something
that both useEffect and componentDidMount have in common.
However, componentDidMount is only supposed to run at the beginning of the
lifecycle and then become dormant. useEffect runs when the component mounts but
also can run at any time when dependencies change. Therefore, if no
dependencies are passed to the second argument array, or if the dependencies
always change, the function continues to run (sometimes causing an infinite
loop).
To have the useEffect only run once when the component mounts remember to pass
an empty array as the second argument (or pass an array with the necessary
dependencies).Copyright © 2021 Codeinu
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