Slice of slices

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

rows := [][]int{}

Assignment

We support various graphs and 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 where the value of each cell is i * j where i and j are the indexes of the row and column respectively.

For example, a 10x10 matrix 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] 
[0 5 10 15 20 25 30 35 40 45] 
[0 6 12 18 24 30 36 42 48 54] 
[0 7 14 21 28 35 42 49 56 63] 
[0 8 16 24 32 40 48 56 64 72] 
[0 9 18 27 36 45 54 63 72 81]