Скачать или смотреть Cannot read property 'map' of undefined – SOLVED for ever

In this video we talk about how to solve a common JavaScript bug. "Uncaught Typerror: Cannot read property 'map' of undefined" in React. Made by Gaurav Adhikari

TypeError: Cannot read property of null" is a common error in programming and occurs when you are trying to access a property of an object that is undefined or null. To resolve this issue, you should first check if the object is defined and not null before attempting to access its properties.

cannot read properties of undefined (reading 'length')
cannot read properties of undefined (reading 'map')
cannot read properties of undefined (reading 'id')
cannot read properties of undefined (reading 'pathname')
cannot read properties of undefined (reading '0')

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