als-statistics/lib/table/add-row.js

A powerful and lightweight JavaScript library for descriptive statistics, regression, clustering, outlier detection, and noise analysis using a flexible table/column architecture.

function addRow(obj, index = null, table) {
   // Проверка соответствия ключей и типов
   const colNames = Object.keys(table.columns);
   for (let key of Object.keys(obj)) {
      if (!colNames.includes(key)) return false;
      const colType = table.columns[key].type;
      if (colType === Number && typeof obj[key] !== 'number') return false;
      if (colType === String && typeof obj[key] !== 'string') return false;
   }
   for (let colName of colNames) {
      if (!(colName in obj)) return false;
   }

   if (index === null || index >= table.n) { // Добавление строки
      for (let [colName, value] of Object.entries(obj)) { // Добавление в конец
         table.columns[colName]._values.push(value);
      }
      table.n++;
   } else { // Вставка по индексу
      for (let [colName, value] of Object.entries(obj)) {
         table.columns[colName]._values.splice(index, 0, value);
      }
      table.n++;
      // Обновление фильтра
      const updatedFiltered = {};
      for (let i in table.filtered) {
         const numIndex = Number(i);
         if (numIndex >= index) updatedFiltered[numIndex + 1] = true;
         else updatedFiltered[numIndex] = true;
      }
      table.filtered = updatedFiltered;
      if (table.maxFilter >= index) table.maxFilter++;
   }
   table.filterState++;
   return true;
}

module.exports = addRow