API Reference > geometry-core > Polyface > PolyfaceBuilder > findOrAddParamInGrowableXYArray findOrAddParamInGrowableXYArray Method Announce param coordinates. The implementation is free to either create a new param or (if known) return index of a prior point with the same coordinates. findOrAddParamInGrowableXYArray(data: GrowableXYArray, index: number): undefined | number Parameter Type Description data GrowableXYArray index number Index of the param in the linestring. Returns - undefined | number Returns the point index in the Polyface. Defined in polyface/PolyfaceBuilder.ts Line 390 Last Updated: 11 June, 2024