Add compose and andThen function to Function1

[stackoverflow]

No description provided.

[StefMa]

Who ever wants to use a compose function? It's super complicated to read/understand 🙈

[bioball]

Can you describe the motivation for this?
The language already provides the pipe operator, which provides similar functionality.
So, to add this, I think we should have some rationale for why an additional API makes sense.

local addOne = (x) -> x + 1
local double = (x) -> x * 2

res1 = 5 |> addOne |> double

Might be good to have a SPICE.

[stackoverflow]

Can you describe the motivation for this? Why not just use the pipe operator?

local addOne = (x) -> x + 1
local double = (x) -> x * 2

res1 = 5 |> addOne |> double

Might be good to have a SPICE.

The pipe operator is function application not composition. If you are providing functions for others to use you don't know what they'll be applied to.
Sure you can just create another lambda yourself:

local addOneAndDouble = (x) -> double.apply(addOne.apply(x))

But using a function for that is more ergonomic and readable, specially when there's a bunch of lambdas to be connected.

local addOneAndDouble = addOne.andThen(double)

These functions are similar to the same named ones in Scala, or the . operator in Haskell, the >> and << operators in F#, etc.

I don't think we need a spice for them, specially because they don't pollute the global namespace.