Cannot read properties of undefined (reading ‘tolocalestring’)

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The error “TypeError: Cannot read properties of undefined (reading ‘toLocaleString’)” occurs when you are trying to access the property ‘toLocaleString’ of an undefined variable in JavaScript. This error typically happens when you are trying to call a method or access a property on a variable that has not been defined or is null.

Here’s an example to illustrate this error: 

    
var myVariable;
console.log(myVariable.toLocaleString()); // Throws a "TypeError" as myVariable is undefined

var myOtherVariable = null;
console.log(myOtherVariable.toLocaleString()); // Throws a "TypeError" as myOtherVariable is null

In the above example, the variable ‘myVariable’ is undefined and trying to access the ‘toLocaleString’ method on it throws a TypeError. Similarly, if a variable is explicitly assigned a value of null, trying to access its ‘toLocaleString’ method will also throw the same error.

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