export function uncompactCells()

in lib/h3core.js [1203:1243]

• 41 lines of code
• 5 McCabe index (conditional complexity)

export function uncompactCells(compactedSet, res) {
    validateRes(res);
    if (!compactedSet || !compactedSet.length) {
        return [];
    }
    // Set up input set
    const count = compactedSet.length;
    const set = C._calloc(count, SZ_H3INDEX);
    storeArrayOfH3Indexes(set, compactedSet);
    // Estimate how many hexagons we need (always overestimates if in error)
    const uncompactCellSizePtr = C._malloc(SZ_INT64);
    try {
        throwIfError(
            H3.uncompactCellsSize(set, count, UNUSED_UPPER_32_BITS, res, uncompactCellSizePtr)
        );
        const uncompactCellSize = validateArrayLength(
            readInt64AsDoubleFromPointer(uncompactCellSizePtr)
        );
        // Allocate memory for uncompacted hexagons
        const uncompactedSet = C._calloc(uncompactCellSize, SZ_H3INDEX);
        try {
            throwIfError(
                H3.uncompactCells(
                    set,
                    count,
                    UNUSED_UPPER_32_BITS,
                    uncompactedSet,
                    uncompactCellSize,
                    UNUSED_UPPER_32_BITS,
                    res
                )
            );
            return readArrayOfH3Indexes(uncompactedSet, uncompactCellSize);
        } finally {
            C._free(set);
            C._free(uncompactedSet);
        }
    } finally {
        C._free(uncompactCellSizePtr);
    }
}