Function pivotKeys

docs/app/js/sanddance-app.js:118139–118150

(key, limit, pulse)

    return (0, _vegaUtil.accessor)((d)=>key(d) === k ? value(d) : NaN, fields, k + "");
} // Collect (and optionally limit) all unique pivot values.
function pivotKeys(key, limit, pulse) {
    const map = {}, list = [];
    pulse.visit(pulse.SOURCE, (t)=>{
        const k = key(t);
        if (!map[k]) {
            map[k] = 1;
            list.push(k);
        }
    });
    list.sort((0, _vegaUtil.ascending));
    return limit ? list.slice(0, limit) : list;
}
/**
 * Partitions pre-faceted data into tuple subflows.
 * @constructor