JavaScript inline functions like in C++

Question

Is there any ability in future ECMAScript standards and/or any grunt/gulp modules to make an inline functions (or inline ordinary function calls in certain places) in JavaScript like in C++?

Here an example of simple method than makes dot product of vectors

Vector.dot = function (u, v) {
  return u.x * v.x + u.y * v.y + u.z * v.z;
};

Every time when I'am writing somethink like

Vector.dot(v1, v2)

I want be sure that javascript just do this calculations inline rather then make function call

Answer 1

Given that the OP asks for performance, I will try to provide an answer.

If you are optimizing for the V8 engine, you can check the following article to see which functions are inlined, and how deoptimization affects your code.

http://floitsch.blogspot.com/2012/03/optimizing-for-v8-inlining.html

For example, if you want to see if Vector.dot is inlined, use the following command line where script.js contains both your definition and calling code:

d8 --trace-inlining script.js 

The optimization algorithm differs from engine to engine, but the inlining concept should be pretty much the same. If you want to know about other engines, please modify the question to including the exact engine in order to get some insights from JS engine experts.