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Slice of Slices

Slices can hold other slices, effectively creating a matrix, or a 2D slice.

rows := [][]int{}
rows = append(rows, []int{1, 2, 3})
rows = append(rows, []int{4, 5, 6})
fmt.Println(rows)
// [[1 2 3] [4 5 6]]

Assignment

We support various visualization dashboards on Textio that display message analytics to our users. The UI for our graphs and charts is built on top of a grid system. Let's build some grid logic.

Complete the createMatrix function. It takes a number of rows and columns and returns a 2D slice of integers. The value of each cell is i * j where i and j are the indexes of the row and column respectively. Basically, we're building a multiplication chart.

For example, a 5x10 matrix, produced from calling createMatrix(5, 10), would look like this:

[0  0  0  0  0  0  0  0  0  0]
[0  1  2  3  4  5  6  7  8  9]
[0  2  4  6  8 10 12 14 16 18]
[0  3  6  9 12 15 18 21 24 27]
[0  4  8 12 16 20 24 28 32 36]