A Golang Function which takes a Reader and Returns a Map and an Error

cvstomap.go

func CSVToMap(reader io.Reader) (map[string]string, error) {
	csvReader := csv.NewReader(reader)

	header, err := csvReader.Read()
	if err != nil {
		return nil, fmt.Errorf("failed to read header: %w", err)
	}

	if len(header) < 2 {
		return nil, fmt.Errorf("CSV file must have at least two columns")
	}

	targetMap := make(map[string]string)

	for {
		record, err := csvReader.Read()
		if err == io.EOF {
			break
		}
		if err != nil {
			return nil, fmt.Errorf("failed to read record: %w", err)
		}

		// Add here if you are not sure that every record has 2 line
		// if len(record) < 2 {
		//     return nil, fmt.Errorf("invalid record format at line %d", len(symbols)+1)
		// }
          
		targetMap[record[0]] = record[1]
	}

	return targetMap, nil
}