For example: const colors = Ĭonsole.log(colors) // This will throw an error, because the index 3 is out of bounds of the array This error can also occur when you are trying to access an element of an array using an index that is outside of the bounds of the array. Check if the variable is defined before accessing its properties Define a variable with a default valueĬonsole.log(user.name) // Outputs: 'John Doe'Īlternatively, you could check if the variable is undefined before you try to access its properties, like this: // Define a variable, but don't give it a value You can do this by either assigning a value to the variable when you declare it, or by assigning a value to it later in your code. To fix this error, you need to make sure that the variable has been assigned a value before you try to access its properties. ![]() Try to access a property of the variableĬonsole.log(user.name) // Throws 'Cannot read property 'name' of undefined' Here's an example of how this error could be thrown: // Define a variable, but don't give it a value In general, this error occurs when you are trying to access a value that is undefined, either because it was never assigned a value, or because it was explicitly set to undefined.
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