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How to remember JavaScript's weird capital letters in function names?

 They are written in a style called "lower camel case".


What is that?

Camel case (sometimes stylized as camelCase or CamelCase, also known as camel caps or more formally as medial capitals) is the practice of writing phrases without spaces or punctuation, indicating the separation of words with a single capitalized letter, and the first word starting with either case. Common examples include "iPhone" and "eBay". It is also sometimes used in online usernames such as "johnSmith", and to make multi-word domain names more legible, for example in promoting "EasyWidgetCompany.com".

Camel case is often used as a naming convention in computer programming, but is an ambiguous definition due to the optional capitalization of the first letter. Some programming styles prefer camel case with the first letter capitalised, others not.[1][2][3] For clarity, this article calls the two alternatives upper camel case (initial uppercase letter, also known as Initial Capitals, Initial Caps, InitCaps or Pascal case) and lower camel case (initial lowercase letter, also known as dromedary case). Some people and organizations, notably Microsoft,[2] use the term camel case only for lower camel case.


Source: 

[https://en.wikipedia.org/wiki/Camel_case]

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