Template strings in ES2015

Question

What is the meaning of "passed array is frozen" in the context of template strings in ES2015?

Source: http://node.green

Answer 1

It doesn't mean any special in the context of template strings. It just means that the array is frozen. From the docs:

An object is frozen if and only if it is not extensible, all its properties are non-configurable, and all its data properties (that is, properties which are not accessor properties with getter or setter components) are non-writable.

So the array of strings that is getting passed into the tag function is essentially immutable. This is supposed to allow engines to store it as a constant and repeatedly pass the same array object every time the tagged template literal is evaluated.