index.js

import { ERRORTYPES as error } from "./error";
import isarray from "./isarray";
import isblank from "./isblank";

export default function index(reference, row_num, column_num = 1) {
  var row;

  if (!isarray(reference) || isblank(row_num)) {
    return error.value;
  }

  if (reference.length < row_num) {
    return error.ref;
  }

  row = reference[row_num - 1];

  if (!isarray(row)) {
    return error.value;
  }

  if (row.length < column_num) {
    return error.ref;
  }

  return row[column_num - 1];
}