Is init() a javascript function?

Question

I always see many codes using this, and If it's a function, what is It for?

Answer 1

I can't find any manuals on this, are you sure it's not just a function called 'init' that the person created?

So what it does depends on what's in the functions block.

I don't code in Javascript much at all, but I'm assuming it could be a common practice to call something init() when all it does is initialize variables.

For another common practice naming example you can look at the for loop:
for(var i = 0; i < 10; i++)
{}
You'll likely see 'i' a lot. That's just the name of the variable, much like how I assume init() is just the name of the function.

If you see 'init();'
Then that's calling the function called init.

Answer 2

The init function that you're seeing is not a part of the JavaScript language, but either a part of the individual programmers code as @Rrestoring faith stated, or possibly part of a framework or library. JavaScript by itself doesn't have a built in function called init().