Programmers usually have a problem when they have to use more than one word to describe something, but they are not allowed to use spaces or punctuation signs. An example of this would be to name files. If someone wants, for instance, to name a picture where 2 people are talking, he would like to write John and Mike talking.jpg, but since a filename cannot contain spaces, he may write something like john-and-mike-talking.jpg

To do this, there are many popular conventions, even though they are not standarized. Let’s take a look at some of them.

Camel case

This system consists in writing compound words or phrases such that each word in the middle of the phrase begins with a capital letter.

suchWonderfulBlog.txt

leaveCommentsBelow.pdf

Pascal case

This is a variation from camel case notation. The only difference is that the first letter of the first word is also capitalized. Also called upper camel case.

SuchWonderfulBlog.txt

LeaveCommentsBelow.pdf

Snake case

In this notation each word will be joined together with a unique underscore.

such_wonderful_blog.txt

leave_comments_below.pdf

Kebab case

This case is similar to snake case, but instead of using an underscore, an hyphen is used to join words together.

such-wonderful-blog.txt

leave-comments-below.pdf

Let me know if I have missed something!