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To use the `charCodeAt()` method in TypeScript, you can simply call it on a string variable and pass in the index of the character you want to get the Unicode value for. For example:
let myString = "Hello World";
let unicodeValue = myString.charCodeAt(1);
In this example, the `charCodeAt()` method is called on the `myString` variable with an index of 1. This will return the Unicode value of the second character in the string, which is the letter “e”. The Unicode value of “e” is 101.
It’s important to note that the `charCodeAt()` method returns NaN (Not a Number) if the specified index is out of range or if the string is empty. Therefore, it’s a good practice to check the return value of this method before using it in your code.