What is "into" used for?

[Lee]

I noticed I needed to use "into" when using "intersection". Why is this? When is it appropriate to use "into" ?

[Doug Moen]

The documentation is here:

https://github.com/curv3d/curv/blob/master/docs/language/Functions.rst#into

'a >> into f [b, c, ...]' means 'f [a, b, c, ...]'

dodecahedron >> colour red >> into union [icosahedron]

means:

union [colour red dodecahedron, icosahedron]

So 'into' is just a way of writing pipelines using the '>>' operator, instead of writing nested function calls. I often writing pipelines with 12 or so operators. With function call notation, the parentheses would become deeply nested if I was using ordinary function call notation, and I would have to read the code from right to left. I prefer linear pipelines with no nesting, it's like a bash pipeline with the data flowing left to right.

The definition of 'into' is found in `lib/curv/std.curv` in the repo:

     into f rest first = f [first, ...rest];

Doug Moen.

On Fri, Sep 10, 2021, at 12:30 PM, Lee wrote:

I noticed I needed to use "into" when using "intersection". Why is this? When is it appropriate to use "into" ?

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[Lee]

Ah! That makes a lot of sense. After reading the arguments for `intersection` it made more sense to me, but I actually thought it was defined as: `into f first rest` !

[Doug Moen]

Lee has created a #curv3d discussion channel on Discord.

https://discord.gg/9q4AeWvD

There has already been some interesting discussion about splines (with code), metaballs, and Lee's projects: creating a CadQuery like interface for Curv, and creating a soft-, organic-looking engineering part for a videogame controller.