If you have a multi-dimensional array, you can use the same logic as the prior waypoint to loop through both the array and any sub-arrays. Here is an example:
var arr = [
[1,2], [3,4], [5,6]
];
for (var i=0; i < arr.length; i++) {
for (var j=0; j < arr[i].length; j++) {
console.log(arr[i][j]);
}
}
This outputs each sub-element in arr one at a time. Note that for the inner loop, we are checking the .length of arr[i], since arr[i] is itself an array.
Modify function multiplyAll so that it multiplies the product variable by each number in the sub-arrays of arr
I’m wondering why my code below doesn’t work. I am having trouble understanding the differences between a parameter and a variable. Why do some people have the correct code with just replaying multiplyAll in the code below with “arr”. I am not too sure how that helps, since isn’t that a parameter which tells the user that there is going to be something included after the variable “multiplyAll”?
Thank you in advance.
Any help would be greatly appreciated.
function multiplyAll(arr) {
var product = 1;
// Only change code below this line
for (var i = 0; i < multiplyAll.length){
for (var j = 0; j < multiplyAll[i].length){
product *= multiplyAll[i][j];
}
}
// Only change code above this line
return product;
}
// Modify values below to test your code
multiplyAll([[1,2],[3,4],[5,6,7]]);