Function inferColumns

docs/app/js/sanddance-app.js:109230–109236

(rows)

}
// Compute unique columns in order of discovery.
function inferColumns(rows) {
    var columnSet = Object.create(null), columns = [];
    rows.forEach(function(row) {
        for(var column in row)if (!(column in columnSet)) columns.push(columnSet[column] = column);
    });
    return columns;
}
function pad(value, width) {
    var s = value + "", length = s.length;
    return length < width ? new Array(width - length + 1).join(0) + s : s;