[dankwizard]

No - An array is a data structure that stores pre-calculated values in memory, whereas a function is executable logic that computes a result only when it is called.

[emmelaich]

Not a semantic difference, just a performance difference ... and a function can cache for the same performance anyway.

[wvenable]

Correct. But indexing into an array is logic that computes a result when it is called.

[adastra22]

There are two opposing philosophical viewpoints here. Some view mathematics as a model for understanding the real world. Some see the real world as instantiation of mathematics.

Is an array a function? From one perspective, the array satisfies the abstract requirements we use to define the word "function." From the other perspective, arrays (contiguous memory) exist and are real things, and functions (programs) exist and are something else.