Nesting For Loops in JavaScript - freeCodeCamp.org
To do this, set up a for loop like you've done in previous challenges: function multiplyAll (arr) { let product = 1; // Only change code below this line for (let i = 0; i < arr.length; i++) { } // Only change code above this line return product; } multiplyAll ( [ [1,2], [3,4], [5,6,7]]);