valid Archives - Simon Technology Blog

ReactJS – The valid React element (or NULL) must be returned. You may have returned undefined, array, or other invalid objects

I am new to ReactJS and I have a problem. I can’t solve it. Everything seems to be fine, but the console still lets me:

A valid React element (or null) must be returned. You may have
returne

October 21, 2021By Simo React Arrays, can, Elements, invalid, must, null, object, Other, React, Reactjs, return, Some, undefined, valid, You canLeave a Comment

[LC] 125. Valid Palindrome

Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.

Note: For the purpose of this problem, we define empty string as valid palindrome

October 9, 2021By Simo Rom LC, palindrome, validLeave a Comment

iPhone – IOS filter NSFETCHEDRESULTSCONTROLLER is valid

I’m trying to add search support to UITableView that supports Core Data, and I’m starting to experience some performance issues. I’m currently associated with two NSFetchedResultsControllers (one f

September 23, 2021By Simo iPhone filter, IOS, iPhone, nsfetchedresultscontroller, validLeave a Comment