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Task/CSV-data-manipulation/Go/csv-data-manipulation.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"encoding/csv"
+	"io"
+	"log"
+	"os"
+	"strconv"
+)
+
+func init() {
+	log.SetFlags(log.Lshortfile)
+}
+
+func main() {
+	// Open the sample file given.
+	csvFile, err := os.Open("sample.csv")
+
+	// Exit on error.
+	if err != nil {
+		log.Fatal("Error opening sample csv file:", err)
+	}
+
+	// Make sure the file is closed before the function returns.
+	defer csvFile.Close()
+
+	// Create a new csv reader for the file.
+	csvReader := csv.NewReader(csvFile)
+
+	// Create an output file.
+	outputFile, err := os.Create("output.csv")
+	if err != nil {
+		log.Fatal("Error creating output file:", err)
+	}
+	defer outputFile.Close()
+
+	csvWriter := csv.NewWriter(outputFile)
+	defer csvWriter.Flush()
+
+	// For each row in the data.
+	for i := 0; ; i++ {
+		record, err := csvReader.Read()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			log.Fatal("Error reading record:", err)
+		}
+
+		// Skip header row.
+		if i == 0 {
+			err = csvWriter.Write(record)
+			if err != nil {
+				log.Fatal("Error writing record to output file:", err)
+			}
+			continue
+		}
+
+		// For each cell in the row.
+		for cell := range record {
+			// Convert value to integer for manipulation.
+			v, err := strconv.Atoi(record[cell])
+			if err != nil {
+				log.Fatal("Error parsing cell value:", err)
+			}
+
+			// Do something to the value.
+			v += 1
+			// Store the new value back in the record variable.
+			record[cell] = strconv.Itoa(v)
+		}
+
+		// Write modified record to disk.
+		err = csvWriter.Write(record)
+		if err != nil {
+			log.Fatal("Error writing record to output file:", err)
+		}
+	}
+}