The browser storage localStorage is not available. Either your browser does not support it or you have disabled it or the maximum memory size is exceeded. Without localStorage your solutions will not be stored.

Array of arrays

So far we have stored numbers, strings and boolean values in arrays. But you can also store arrays in arrays:
let teams = [
  ['Ruby', 'Angel'],
  ['Mia', 'Yui', 'Merve', 'Elif'],
  ['Saanvi', 'Giulia', 'Zeynep']

let row1 = [4, 9, 2];
let row2 = [3, 5, 7];
let row3 = [8, 1, 6];
let loshu = [row1, row2, row3];
In the first example, 3 teams are stored in an array. Each team itself is an array of names. The individual teams have different sizes. With
let team = teams[0];
you can access a team and with
let member = teams[0][0];
you can access an individual team member.

Arrays that contain arrays are also called two-dimensional arrays. Carrying this on, you get three- or multidimensional arrays.

In the second example, the Lo Shu Square is stored in a two-dimensional array.


Write a function flat that flattens a two-dimensional array with 3 entries.

Example: flat(loshu) should return [4, 9, 2, 3, 5, 7, 8, 1, 6]. Thereby loshu is the magic square from the example above.