Function getColumnsFromData

packages/sanddance-specs/src/inference.ts:20–33

(inferTypesFn: typeof inferTypes, data: object[], columnTypes?: ColumnTypeMap)

 * @param data Array of data objects.
 */
export function getColumnsFromData(inferTypesFn: typeof inferTypes, data: object[], columnTypes?: ColumnTypeMap) {
    const sample = data[0];
    const fields = sample ? Object.keys(sample) : [];
    const inferences = { ...inferTypesFn(data, fields), ...columnTypes };
    const columns = fields.map(name => {
        const column: Column = {
            name,
            type: inferences[name],
        };
        return column;
    });
    inferAll(columns, data);
    return columns;
}

/**
 * Get columns associated with each Insight role.