Is there a way syntactically to assign all the values of a builtin array in one command?

A beginner question here on array syntax, I would like to assign all of the values in a builtin array at once something like,

myArray = new float[3]; myArray = (1,2,3);

I can of course set all of the values in the inspector, but that is not practical for large arrays. Is there a way to do this with a builtin array, or must I use a loop and set each array value individually?

In C# you can do that like this:

public float[] MyArray = { 1, 2, 3, 4, 5, 6 };