Which of the following choices is a properly formed javascript variable name, meaning it is both legal in the javascript language and considered good style

a. user_age
b. userage
c. userage
d. user age

userAge ( C )

Explanation:

The option (C) is called a camel case and it is used in JavaScript language to to form JavaScript variable name more frequently. it is legal and a good style as well  because it is used to different variable names as well.

The option ( B ) is known as pascal case and it can be used in various languages as well, it is used to form a more general variable name and it is not considered a good style in JavaScript language when a specific variable name is to be formed. it is not considered a very good style and it is not very much used like the camel case in JavaScript language.

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