Two-Dimensional Slices (Tabular Data)

In this lesson you will learn how to use two-dimensional slices in Go so you can work with data laid out as a table. This is for anyone searching for "Go 2D slice how to use".

Putting slices inside a slice gives you a grid with rows and columns. This is called a two-dimensional slice, and you access it as grid[row][column].

The sample code declares two rows of three columns and reads a value with grid[1][2], then prints each row with for _, row := range grid. Notice how printing a slice directly shows it in the [1 2 3] form.

A common stumbling block for beginners is the order of the indexes. grid[1][2] means "row 2, column 3", and mixing up which is which gives you the wrong value.

In real-world development this idea applies whenever you want to handle grid-shaped data efficiently, from a game board with coordinates to large two-dimensional data in image processing.

📖 Reference code

package main

import "fmt"

func main() {
    grid := [][]int{
        {1, 2, 3},
        {4, 5, 6},
    }
    fmt.Println(grid[1][2])
    for _, row := range grid {
        fmt.Println(row)
    }
}

✍️ Your code

Type your code, then press "Run"

🧪 This site can't compile or run Go directly, so it checks on the spot whether what you typed matches the reference code (scoring happens entirely in your browser — nothing is sent anywhere).