# Read and Write CSV file in go language!

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### Introduction

CSV (Comma Separated Value) files are a common way of storing data that can be read by various software applications. CSV files are plain text files that contain a list of data records separated by commas. Go provides an easy and efficient way to read and write CSV files.

In this article, we will learn how to read and write CSV files in Go.

### Prerequisites

Before we start, we need to have Go installed on our system. We can download and install the latest version of Go from the official Go website.

### Reading CSV Files

Go provides a built-in package called "encoding/csv" that allows us to read CSV files. We can use this package to read a CSV file and store its contents in a 2D slice.

Here is an example of how to read a CSV file:

```go
package main

import (
    "encoding/csv"
    "fmt"
    "os"
)

func main() {
    // Open the CSV file
    file, err := os.Open("data.csv")
    if err != nil {
        fmt.Println("Error:", err)
        return
    }
    defer file.Close()

    // Create a new reader
    reader := csv.NewReader(file)

    // Read all the records
    records, err := reader.ReadAll()
    if err != nil {
        fmt.Println("Error:", err)
        return
    }

    // Print the records
    fmt.Println(records)
}
```

In this example, we first open the CSV file using the [`os.Open`](http://os.Open)`()` function. If there is an error, we print it and return. Next, we create a new `csv.Reader` and pass the `file` object to it. Finally, we call the `ReadAll()` function to read all the records from the CSV file and store them in a 2D slice called `records`.

### Writing CSV Files

To write data to a CSV file, we can use the same `encoding/csv` package. We can create a new `csv.Writer` object and write data to it using the `Write()` method. We can also use the `Flush()` method to flush the data to the file.

Here is an example of how to write data to a CSV file:

```go
package main

import (
    "encoding/csv"
    "fmt"
    "os"
)

func main() {
    // Create a new file
    file, err := os.Create("data.csv")
    if err != nil {
        fmt.Println("Error:", err)
        return
    }
    defer file.Close()

    // Create a new writer
    writer := csv.NewWriter(file)

    // Write some records
    records := [][]string{
        {"John", "Doe", "25"},
        {"Jane", "Doe", "30"},
        {"Tom", "Smith", "35"},
    }
    for _, record := range records {
        err := writer.Write(record)
        if err != nil {
            fmt.Println("Error:", err)
            return
        }
    }

    // Flush the data to the file
    writer.Flush()
}
```

In this example, we first create a new file using the `os.Create()` function. If there is an error, we print it and return. Next, we create a new `csv.Writer` and pass the `file` object to it. We then write some records to the writer using the `Write()` method. Finally, we call the `Flush()` method to flush the data to the file.

### Conclusion

In this article, we learned how to read and write CSV files in Go. Go provides a built-in package called `encoding/csv` that makes it easy to read and write CSV files. We can use the `csv.Reader` object to read CSV data.

I hope this helps, you!!

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