Function collect

docs/app/js/sanddance-app.js:116171–116177

(cells)

    cross () {
        const aggr = this, curr = aggr.value, dims = aggr._dnames, vals = dims.map(()=>({})), n = dims.length; // collect all group-by domain values
        function collect(cells) {
            let key, i, t, v;
            for(key in cells){
                t = cells[key].tuple;
                for(i = 0; i < n; ++i)vals[i][v = t[dims[i]]] = v;
            }
        }
        collect(aggr._prev);
        collect(curr); // iterate over key cross-product, create cells as needed
        function generate(base, tuple, index) {