function multiplyAll(arr) {
var product = 1;
// Only change code below this line
// Only change code above this line
return product;
}
multiplyAll([[1,2],[3,4],[5,6,7]]);
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The example code given in the challenge pretty much takes you 85% through the challenge.
for (var i=0; i < arr.length; i++) {
for (var j=0; j < arr[i].length; j++) {
console.log(arr[i][j]);
}
}
Now instead of logging the array elements console.log(arr[i][j]) you need to multiply the element value with product and assign the result back to product.
let number = 50;
number *= 2;
console.log(number); // 100
number *= 2;
console.log(number); // 200