JS Help: Explanation please [spoiler]

function multiplyAll(arr){

var product=1

for (var i=0;i<arr.length;i++){
for (var j=0;j<arr[i].length;j++){

return product

var product=multiplyAll([[1, 2], [3, 4], [5, 6, 7]])


Could somebody please explain to me what is going on in the italicized statement(product*=arr[i][j])?

Can you please use the </> button or put three backticks ``` on new lines before and after your block of code so that we can see it?

You have an array of arrays. The line product *= arr[i][j] multiplies the current value of the product by the next entry in your array of arrays, specifically the i,j entry.

You have an array called arr. arr = ([[1, 2], [3, 4], [5, 6, 7]]), so it is an array with sub-arrays.
Let’s say i=0 and j=0 for this example.
arr[i] is arr[0] which means the value at index 0 of arr. That value is [1, 2].
arr[i][j] is arr[0][0] which means the value of index 0 at index 0 of arr. That value is 1.

Thank-you for helping me. So, the product is being multiplied by the the array j (index), and array i (counts the number of arrays). But if the array is being multiplied by the array, how does that work? The console would show up as NaN. Please explain further.