ERROR TypeError Cannot read property toLowerCase of undefined js engine hermes

This error indicates that you are trying to call the toLowerCase method on an undefined value in your JavaScript code.

The toLowerCase method is used to convert a string to lowercase, but in this case, the value you are trying to call it on is undefined.

To fix this error, you need to make sure that the value you are trying to call toLowerCase on is a valid string. You can do this by checking if the value is undefined before calling the method.

Here's an example of how you can handle this error:

let str = undefined;

if (str !== undefined) {
  let lowercaseStr = str.toLowerCase();
  console.log(lowercaseStr);
} else {
  console.log("The string is undefined.");
}

In this example, the code checks if the str variable is undefined before calling the toLowerCase method, and if it is undefined, it prints a message instead of calling the method