toUpperCase and toLowerCase in JavaScript Method

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toUpperCase and toLowerCase in JavaScript Method
In JavaScript, `toUpperCase` and `toLowerCase` are methods used to convert the characters of a string to uppercase or lowercase, respectively.
**toUpperCase**: This method returns a new string with all the characters of the original string converted to uppercase. It does not modify the original string but produces a new string where all the letters are in uppercase form.
**toLowerCase**: This method returns a new string with all the characters of the original string converted to lowercase. Similar to `toUpperCase`, it does not change the original string but creates a new string where all the letters are in lowercase form.
Both methods are commonly used when you need to standardize the case of the text for comparison, display, or storage purposes. For example, you might convert user input to a consistent case before checking against a database or displaying it in a user interface to maintain a uniform look.
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