Best Of

Yeah, you shouldn't use LLMs for this. They don't replace understanding, especially for a specialized language like FS. You'll get a nice-looking snippet quickly and then spend a hundred times as long finding the issues.

Michael's suggestion is really the answer here. Failing that, search the forum for custom features that already do this, or find similar custom features and understand their code.

Compare and contrast - this is why you should not use ChatGPT, it's not even close…

FeatureScript 2615;
import(path : "onshape/std/common.fs", version : "2615.0");

annotation { "Feature Type Name" : "Grid generator", "Feature Type Description" : "" }
export const gridGenerator = defineFeature(function(context is Context, id is Id, definition is map)
    precondition
    {
        annotation { "Name" : "Grid spacing" }
        isLength(definition.spacing, { (millimeter) : [0.1, 100, 100] } as LengthBoundSpec);

        annotation { "Name" : "Rows" }
        isInteger(definition.rows, { (unitless) : [1, 10, 100] } as IntegerBoundSpec);

        annotation { "Name" : "Columns" }
        isInteger(definition.columns, { (unitless) : [1, 10, 100] } as IntegerBoundSpec);
    }

    {
        const sketch = newSketchOnPlane(context, id + "sketch", {
                    "sketchPlane" : plane(vector(0, 0, 0) * millimeter, vector(0, 0, 1))
                });

        for (var i = 0; i < definition.columns; i += 1)
        {
            skLineSegment(sketch, "vertical" ~ i, {
                        "start" : vector(i * definition.spacing, 0 * millimeter),
                        "end" : vector(i * definition.spacing, definition.rows * definition.spacing)
                    });
        }

        for (var j = 0; j < definition.rows; j += 1)
        {
            skLineSegment(sketch, "horizontal" ~ j, {
                        "start" : vector(0 * millimeter, j * definition.spacing),
                        "end" : vector(definition.columns * definition.spacing, j * definition.spacing)
                    });
        }

        skSolve(sketch);
    });

.

The real question here, is why it's taking all our PRO users more than 3 features to do this 😉

https://cad.onshape.com/documents/c4469b7086cad2b01f32d62a/w/2ab04e4a2e6deab95247c28d/e/0727db57411fc…