text: /**
   * @param {Object<str,function(*):boolean>} filterObject
   * @return {Table|TableObject} - mutated 'this' {head, rows}
   */
  export const tableFind = function (filterObject) {
    for (let field in filterObject)
      if (filterObject.hasOwnProperty(field))
        tableFindOnce.call(this, field, filterObject[field])
    return this
  }
  
  /**
   * @param {str} field
   * @param {function(*):boolean} filter
   * @return {Table|TableObject} - mutated 'this' {head, rows}
   */
  export const tableFindOnce = function (field, filter) {
    let j = this.head.indexOf(field)
    if (j >= 0) this.rows = this.rows.filter(row => filter(row[j]))
    return this
  }
  