1 Hey! Nice article thankyou! However i would like to ask about the array after arrow function[userLists]? Any difference when i provide 1. no array, 2. empty array and 3 meaningful array like you did?
In that scenerio;
1- if there is no array meaning userList is undefined or null we need to check before applying map function. In that case we can return [] so it will not broke the code.
2- If it is empty array meaning [] this should be ok because it is an Array instance so it will just return [].
Did this make it clear or you were asking something else
Yes that was clear, thank you!
I wanted to ask this question because when using useEffect, array or no array makes difference on rendering. Just wondering if that‘s the same with useMemo :)
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1 Hey! Nice article thankyou! However i would like to ask about the array after arrow function[userLists]? Any difference when i provide 1. no array, 2. empty array and 3 meaningful array like you did?
In that scenerio;
1- if there is no array meaning
userListisundefinedornullwe need to check before applying map function. In that case we can return[]so it will not broke the code.2- If it is empty array meaning
[]this should be ok because it is an Array instance so it will just return[].Did this make it clear or you were asking something else
Yes that was clear, thank you!
I wanted to ask this question because when using useEffect, array or no array makes difference on rendering. Just wondering if that‘s the same with useMemo :)