Hi Phil,

You are welcome.

Table is just semantic sugar -- a "macro" in other programming languages. Blend doesn't really exist, either.

Actually, it is not semantic sugar and they both do exist as functions (pattern -> replacement). The reason they do not appear in the FullForm is that its argument has been evaluated before passing it to FullForm. It does not hold its arguments

Attributes@FullForm
(* {Protected} *)

So it is the FullForm of the evaluated expression.

1 + 1 // FullForm
(* 2 *)

1 + 1 // Hold // FullForm
(* Hold[Plus[1, 1]] *)

At its core, the WL is a term rewriting system. Watch the 3 video presentations by Professor Richard J. Gaylord for an overview of how WL uses term rewriting. This is also worth a read.

Thanks for your answers, Rohit. You consistently provide great responses here.

I was thrown off by this question, because Blend doesn't take a list as an argument. I finally figured out to run FullForm on the statement to see what was really happening. Aha! Table is just semantic sugar -- a "macro" in other programming languages. Blend doesn't really exist, either. It's now as clear as black and white -- or maybe RGBColor -- what's going on with this exercise. I increased the interval size to decrease the clutter:

FullForm[Table[Blend[{Yellow,Hue[x]}],{x,0,1,.20}]]

List [RGBColor [1., 0.5, 0.],
      RGBColor [0.8999999999999999, 1. , 0.],
      RGBColor [0.5, 1., 0.20000000000000018],
      RGBColor [0.5, 0.6999999999999997, 0.5],
      RGBColor [0.9000000000000004, 0.5, 0.5],
      RGBColor [1., 0.5, 0. ]]

The two takeaways I got from this:

Any sort of assumptions you have mapping other languages onto the Wolfram Language are probably wrong. The WL is a different beast.

I do not understand all the ways that mappings work in this language. Once I do, I may be on my way to being a WL Wizard. Going through many exercises is quite valuable. Stephen's "Elementary Introduction [...]" is my new favorite tutorial.