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Here is an example of how to go through an array of arrays using the each function in JavaScript:

const arrOfArrs = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9]
];

arrOfArrs.forEach((arr) => {
  arr.forEach((num) => {
    console.log(num);
  });
});

In this example, we have an array called arrOfArrs which contains three arrays of numbers. We use the forEach method to go through each array in arrOfArrs, and then use another forEach method to go through each number in the current sub-array. Finally, we log each number to the console.

This will output the numbers 1 through 9 in order.